1.

[13 + 23 + 33 + ……. + 93 + 103] is equal to1). 35752). 25253). 50754). 3025

Answer»

Using the standard identity that the sum of first N CUBES is $({\left[ {\FRAC{{n\left( {n + 1} \right)}}{2}} \right]^2})$, we have

13 + 23 + 33 + ……. + 93 + 103 = $({\left[ {\frac{{10\left( {10 + 1} \right)}}{2}} \right]^2} = {55^2} = 3025)$


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