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Sum of squares of first 'n' natural numbers = n × (n + 1) × (2n + 1) ÷ 6
So, average = n × (n + 1) × (2n + 1) ÷ 6n = (n + 1) × (2n + 1) ÷ 6
= (35 + 1) × (2 × 35 + 1) ÷ 6
= 36 × 71 ÷ 6
= 426
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