Question
Find the sum of squares of first 20 natural
numbers.Solution
Sum of squares of first 'n' natural numbers = n X (n + 1) X (2n + 1) ÷ 6 Required sum = 20 X (20 + 1) X (2 X 20 + 1) ÷ 6 = 20 X 21 X 41 ÷ 6 = 2870
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