Page 116 - Fixtures

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MM 10

5

7.

.C(17,10) MM 10

7

.C(12, 5)
.C(17,10)×C(12, 5) = 15402816

[Math counts 1985] ( )

1! + 2! + 3! + + 14 ! + 15!

. 6! = 720 5! = 120 4! = 24 3! = 6 2 ! = 2 1! = 1 )
. 0 15 ! 6!
. 3 1! + 2! + 3! + 4 ! = 33

. 5 [MAΘ 1990] (

.

. .C(5,2) = 10
. 5 × 2 × 2 = 20