Question

1^2+2^2+3^2+...........+20^2=

Answer 1

Answer:

2870

Step-by-step explanation:

We know that sum of squares of natural numbers upto n

=[n(n+1)(2n+1)]/6

here, n=20

So, sum=(20x21x41)/6=2870

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Answer 2

Answer:

The answer is 2870.:-)^_^