2. Find the sum 20²+19²+18²+ ___ +1²
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20²+19²+18²+...+1²
Sum of n square no.s = n×(n+1)×(2n+1)6n×(n+1)×(2n+1)6
= 20(20+1) × (2×20+1)6 × 20 × (20+1) × 6 × 20 × (20+1) × (2×20+1)
= 20 × 21 × 41 × 6 × 20 × 21 × 6 × 20 × 21 × 41
= 4.4835094
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