How to Figure Drawing Chance

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How to Estimate Drawing Chance

Updated on December 13, 2016



Impinging Writer


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Dez has been a mathematician since degree civilise and has a headmaster’s grade in Applied Maths.

As a mathematician, I birth ne’er purchased a drawing slate. I breakthrough the odds cheerless and bear ne’er had fate in fetching anything from these kinds of games.

This hub is all most calculative drawing chance or odds. In gild to arrive more relevant to me, I distinct to bag it on the Grandlotto 6/55, the drawing punt with the biggest plunder money hither in the Philippines. Thither bequeath be two dissimilar cases discussed in the hub: the chance of victorious the stake with all six numbers co-ordinated, and the chance of having n numbers twin.

Rules of the Drawing Punt

It is e’er authoritative to hear the rules of any stake ahead active in it. For the Grandlotto 6/55, in gild to win the kitty plunder, you get to lucifer six numbers from a kitty of 55 numbers ranging from 1-55. The initial payout is a minimal of P20 (or roughly $0.47). It is besides potential to win around money if you are able-bodied to compeer 3, quartet, or fin numbers of the victorious compounding. Billet that the club of the victorious compounding hither does not count.

Hither is a tabularise for the prizes you can hold:

No. of Duplicate Nos.

Trophy Money (in Php)

Swag Money (in $)


minimal of 30 meg











Approximately Chance Concepts

Ahead we jump with the calculations, I would similar to discuss Permutations and Combinations . This is one of the introductory concepts you acquire in Chance Possibility. The principal conflict beingness that permutations reckon club to be authoritative, patch in combinations, fiat isn’t significant.

In a drawing slate, substitution should be secondhand if the numbers in your slate suffer to compeer the ordering of the haulage for the victorious chain of numbers. In the Grandlotto 6/55, fiat is not crucial because bye as you sustain the taking set of numbers, you can win the booty.

The succeeding formulas lonesome employ for numbers without repeat . This agency that if the figure x is worn, it cannot be raddled again. If the routine worn from the set is returned earlier the following haulage, so that has repeating.

This is the normal for Permutations, where ordering is crucial. | Root

This is the pattern for Combinations, where rescript is not crucial. | Origin

, where n! = n * (n – 1) * (n – 2) * … * 3 * 2 * 1.

Annotation that based on the formulas presumption, C(n,k) is e’er less than or capable P(n,k). You testament see afterward why it is significant to piddle this differentiation for calculative drawing odds or chance.

How to Reckon Drawing Chance for 6 Coordinated Numbers

So now that we cognize the canonical concepts of permutations and combinations, let us recuperate to the model of Grandlotto 6/55. For the stake, n = 55, the aggregate numeral of potential choices. k = 6, the turn of choices we can pee. Because gild is not authoritative, we leave use the expression for combining:


These are the odds or the add routine of potential combinations for any 6-digit figure to win the gamey. To uncovering the chance, upright split 1 by the turn supra, and you bequeath get: 0.0000000344 or 0.00000344%. See what I signify by uncheerful odds?

So what if we’re talk most a unlike drawing punt where gild does count. We bequeath now use the replacement pattern to get the followers:


Comparison these two results and you bequeath see that the odds for acquiring the victorious combining where fiat matters has 3 extra nada’s! It’s sledding from most 28 1000000:1 odds to 20 zillion:1 odds! The chance of fetching for this lawsuit is 1 shared by the odds which equals to 0.0000000000479 or 0.00000000479%.

As you can see, because the transposition is e’er greater than or capable the combining, the chance of taking a punt where decree matters is perpetually less than or capable the chance of taking a back where club does not count. Because the peril is greater for games where gild is requisite, this implies that the reinforce moldiness likewise be higher.

How to Reckon Drawing Chance with Less Than 6 Twin Numbers

Because you can too win prizes if you get less than 6 twinned numbers, this subdivision volition establish you how to figure the chance if thither are x matches to the fetching set of numbers.

Low, we pauperism to receive the issue of way to prefer x victorious numbers from the set and reproduce it by the figure of shipway to prefer the losing numbers for the left 6-x edubirdieprice reviews numbers. Conceive the routine of slipway to take x fetching numbers. Because thither are sole 6 potential fetching numbers, in gist, we are lonesome choosing x from a kitty of 6. So, because edict does not subject, we get C(6, x).

Succeeding, we believe the act of shipway to opt the leftover 6-x balls from the puddle of losing numbers. Because 6 are taking numbers, we get 55 – 6 = 49 balls to prefer the losing numbers from. So, the routine of possibilities for choosing a losing ballock can be obtained from C(49, 6 – x). Again, gild does not thing hither.

So, in gild to cipher the chance of fetching with x co-ordinated numbers out of a potential 6, we motive to separate the resultant from the premature two paragraphs by the summate numeral of possibilities to win with all 6 twinned numbers. We get:


If we indite this in a more cosmopolitan manikin, we get:


, where n = tally figure of balls in the set, k = add routine of balls in the victorious combining for the kitty pillage, and x = sum numbers of balls coordinated the taking set of numbers.

If we use this normal to cipher the chance (and the odds) of victorious the Grandlotto 6/55 with alone x twinned numbers, we get the pursuit:

x matches



Odds (1/Chance)


C(6,0) * C(49,6)/C(55,6)




C(6,1) * C(49,5)/C(55,6)




C(6,2) * C(49,4)/C(55,6)




C(6,3) * C(49,3)/C(55,6)




C(6,4) * C(49,2)/C(55,6)




C(6,5) * C(49,1)/C(55,6)




C(6,6) * C(49,0)/C(55,6)



How to Opt the Fetching Numbers in Drawing

As you can see from the maths therein hub, the chance of victorious the drawing is the like for any 6-number combining usable in the Grandlotto 6/55 back. This is too applicable for former drawing games out thither.

As I was researching for this hub, I came crossways links that aforesaid ne’er opt numbers that are serial, comparable from 1-6 or roughly such falderol. Thither is no such mystical to taking the drawing! Apiece bit is as evenly belike to scrape in the lot as the future routine.

If you are unforced to boldness the rattling niggling chance of taking the drawing, I say go opt any bit you deprivation. You can stand it on your birthdays, limited years, anniversaries, favourable numbers, etcetera. Scarce recollect that with big peril comes bang-up payoff!