Question 50

Calculate the sum of squares from 1 to 9.

Solution

We need to compute 12 + 22 + 32 + …. + (9)2

formula

$$Sum=\frac{n(n+1)(2n+1)}{6}$$

Where n=9

$$Sum=\frac{9(9+1)(18+1)}{6}$$

$$Sum={3\times5\times19}$$

$$Sum=285$$

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