Question

Ques : Choose the correct answer.
A = 11 * 22 * 33 * 44 * 55 * ……..1010. How many zeroes will be there at the end of A ?

Option 1 : 6
Option 2 : 15
Option 3 : 10
Option 4 : None of these


how can we solve this?

Answer 1

option 4 none of these

Answer 2

Answer:

11 is common to all as we have seen in thee series.

now let say

11 * (1,2,3,......up to 91)

no of zero means

1. no of 10th multiple

2. no of 5 multiple

now, total 5 ( 5 to 85) = 9

total 10 ( 10 to 90) = 9

now the as per question there are 1010 is there which also the multiple of 10

so total (9+9+1)=19 zero are there .

so answer will be option4: none of these

Step-by-step explanation: