1.

Find the number of zeroes in 129!1). 312). 333). 354). 37

Answer»

As, 5 × 2 will give a zero and nearest multiple of of 5 below 129 is 125

Number of multiples of 5 in 129! = 125/5 = 25

Number of multiples of 52 ie 25 in 129! = 125/25 = 5

Number of multiple of 53 ie 125 in 129! = 125/125 = 1

∴ Total zero = 25 + 5 + 1 = 31


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