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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
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