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