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1. Find the number of zeroes in 10 x 20 x 30x……x 1000.
- A. 100
- B. 100
- C. 100
- D. 100
Answer: Option B
Explanation:
10 x 20 x 30 x …… x 1000
= (10 x 1) x (10 x2) x (10 x 3) x ………………… x (10 x 1000)
= 10100 x (1 x 2 x 3 x …………… x 100)
= 10100 x 100!
Number of zeroes = 100 + 100/5 + 100/52
= 100 + 20 + 4
= 124
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