Question

How many
hohe square numbers are there between 20
21
​

Answer 1

Answer:

So u need sum of square of numbers between 20 and 100 that means from 21 to 99.

Concept needed to be know -

Sum of square of n natural number from 1 is n (n+1)(2n+1)/6

To find sum of a sequence find its last term and use sigma the summation function to find sum.

That was not so hard I guess..

So first we find sum of square of numbers from 1 to 99 and then from 1 to 20 and then subtract the latter from the former to get what is required.

Step-by-step explanation:

Hope this helps you