Question

(1³+2³+3³ + ... +15³)-(1+2+3+...+15) =
​

Answer 1

Explanation:

According to question,

∴ (1³ + 2³ + 3³ + ........ + 15³) – (1 + 2 + 3 + .... + 15) =

n(n + 1)

² -

n(n + 1)

2 2

Required answer =

15 × 16

² -

15 × 16

2 2

Required answer = (120)² - 120 = 120 × 119 = 14280

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