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Barnsey2 | 23:41 Fri 11th Jul 2008 | Quizzes & Puzzles
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For the mathematic genius among you, given numbers
1 to 30 how many combinations of these numbers in sets of two, i.e. doubles does it take to cover all combinations.
Thanks in advance, my abacus is broken.
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Avatar Image lajohn
use your fingers and toes. those should be enough.
23:44 Fri 11th Jul 2008
Avatar Image glasman
29+28+27.........................+1.
You can do the rest yourself.
23:46 Fri 11th Jul 2008
Avatar Image crofter
There are 30x29/2 combinations (= 435) where numbers are different and the order is not important.

Taking into account the order of selection, there are 30x29 permutations (= 870).

If the numbers can be the same (ie doubles allowed) then there are 30x30 = 900 ordered number pairs.
23:58 Fri 11th Jul 2008

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