(100 − 1)(100 − 2)(100 − 3).......(100

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(100 − 1)(100 − 2)(100 − 3).......(100 − 200) is equal to
100 × 99 × 98 × ....× 3 × 2 × 1

Expression

Expression =	(100 − 1)(100 − 2)(100 − 3).......(100 − 200)
	100 × 99 × 98 × ....× 3 × 2 × 1

= 0 [∵ 100 – 100 = 0]

(100 − 1)(100 − 2)(100 − 3).......(100 − 200)	is equal to
100 × 99 × 98 × ....× 3 × 2 × 1

−	1
	99 × 98 × 97 ×....× 3 × 2 × 1

−	2
	99 × 98 × 97 ×....× 3 × 2 × 1