Question

How many zeroes will be there at the end of the expression $N=10\times 20\times 30...\times 1000?$

• A. 1280
• B. 1300
• C. 1320
• D. None of these

Answer 1

The correct option is D None of these

$N=10\times 20\times \mathrm{30...}\times 1000$
There is one 5 in the multiple of 10.
Therefore are two 5s in the multiple of 25 and three 5s in the multiple of 125.
Now, count the multiple of 5s in the expression, which are $(100+20+4)=124$