Question

Find the number of zeros in 1 × 2 × 3 × 4 × ........ × 15

• A. 8
• B. 6
• C. 3
• D. 4

Answer 1

Answer:

C. 3

1 × 2 × 3 × 4 × ........ × 15 When prime factorisation is done zero is obtained when 5 is multiplied by 2 So here we have to only consider powers of 5{since it occcour least} 5 × 10 × 15 = 5 × 5 × 2 × 5 × 3 = 5^3 number of zeros = power of 5 = 3