Page 82 - Fixtures

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.6 . 3

4

15

: .n4 = 6 n3 = 2 n2 = 4 n1 = 3 n4 n3 n2 n1

. 15! = 6306300

3! × 4! × 2! × 6!

[AIME #2 1992]( )

.A < B <C < D < E ABCDE

A =/ 0

5 .A
.C(9, 5) = 9! = 126

4!×5!

.