Question

answer this question​

Answer 1

Answer:

15

Step-by-step explanation:

You've pages starting from 1

So sum of first 10 pages starting from 1 to 10 would be

55

Now sum of first 20 pages starting from 1 to 20 would be 210

(we'll consider sum upto numbers when it just crosses the sum of numbers after 1 page torn)

Hence if 1 page is torn, so total - remaining sum would give us that 1 page's number.

210 - 195 = 15

Condition : this page should lie in between 1 and 20 as well, does it?

Yes

Hence your answer is verified