General Betting
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can anybody tell me how many 10 folds there are in 15 and 20 selections
and also how many 15 folds there are in 20 selections
if anybody could help that would be great...
thanx
and also how many 15 folds there are in 20 selections
if anybody could help that would be great...
thanx
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10 from 15 is calculated as
15! / 10! x 5!
which simplifies to 3003.
10 from 20 is 184,756
15 from 20 is 15,504
15! / 10! x 5!
which simplifies to 3003.
10 from 20 is 184,756
15 from 20 is 15,504
There is a formula for "any" from "any".
Say 4 folds in 6.
Start with the number of selections and count down how many "folds" you want;
6 x 5 x 4 x 3 = 360
Divide this by the fourfold counted down to 1
4 x 3 x 2 x 1 = 24
so 360/24 = 15
So trebles in 5; 5 x 4 x 3 divided by 3 x 2 x 1 = 60/6 = 10
hth.
Say 4 folds in 6.
Start with the number of selections and count down how many "folds" you want;
6 x 5 x 4 x 3 = 360
Divide this by the fourfold counted down to 1
4 x 3 x 2 x 1 = 24
so 360/24 = 15
So trebles in 5; 5 x 4 x 3 divided by 3 x 2 x 1 = 60/6 = 10
hth.
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