(Q). Find the number of trailing zeros at the end of 40 × 41 × 42 × 43 × ………..till 40 terms.
Solution:- 40 × 41 × 42 × 43 × …….. × 78 × 79
=
so the question has converted that we have to find the number of trailing zeros at the end of
⇒ Now the number of trailing zeros at the end of
Hence number of trailing zeros in the given equation = 18 – 8 = 10 Answer