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  1. (1² + 2² + 3² + .......... + 10²) is equal to
    1. 380
    2. 385
    3. 390
    4. 392
Correct Option: B

Using the given formula ,

1² + 2² + 3² + ... + n² =
n(n + 1)(2n + 1)
6

Here , n = 10
∴ 1² + 2² + 3² + .... + 10² =
10(10 + 1)(20 + 1)
 = 385
6


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