9.
If (1x2 X 3 X 4 X 5 X ....Xn) = n!, then (17! -
16! - 15!) is equal to -
(a) 17 x 15 x 15!
(b) 17 x 15 x 16!
(c) 17 x 16 x 16!
(d) 16 x 15 x 14!
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2
Answer:
a) 17× 15× 15!
Step-by-step explanation:
(17! - 16! - 15!)=
(17×16×15! - 16×15! - 15!)=
(17×16 - 16 - 1)*15!=
(255) × 15! = (17 × 15 × 15!)
tarunsahuu:
tq
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