What is the sum of the cubes of the first 7 natural numbers? Options: A . &nbsp784 B . &nbsp774 C . &nbsp441 D . &nbsp788

Answer: Option A : A Sum of cubes of first n natural numbers is ( n ( n + 1 ) ) 2 4 Putting n = 7, ( 7 ( 7 + 1 ) ) 2 4 ( 7 × 8 ) 2 4 = 784.

What is the sum of the cubes of the first 7 natural numbers?

Question

What is the sum of the cubes of the first 7 natural numbers?

Options:

A . 784

B . 774

C . 441

D . 788

Answer: Option A
:
A
Sum of cubes of first n natural numbers is

\frac{(n (n + 1))^{2}}{4}

Putting n = 7,

\frac{(7 (7 + 1))^{2}}{4}

\frac{(7 \times 8)^{2}}{4}

= 784.

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