Page 108 - Fixtures

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. 7 ! = 35 9! = 126
4!×5!
3!×4!
()
. 35 ×126 = 4410 C BA

DC

. 6! × 7 ! = 630

2!×4! 3!×4!

. 16! − 630 = 15015 − 630 = 14385

8!×8!

100 ABC [Aust.MC 1991] ( )

A>B >C 999

B =/ 0 A =/ 0 :
BA
:C = 0 ()

C(9,2) = 9! = 36 {1,2, … ,9}
2!×7!
.
{1,2, … ,9} C BA :C =/ 0 ( )

. C(9, 3) = 9! = 84

3!!× 6!

. 36 + 84 = 120

[Aust.MC 1991] ( )