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  1. Find 1³ + 2³ + 3³ + .... + 15³
    1. 11025
    2. 13400
    3. 900
    4. 14400
Correct Option: D

According to question, we have,

1³ + 2³ + 3³ + ........ + n³ =
n × (n + 1)
²
2

Here, n = number of terms = 15
∴
n(n + 1)
² =
15 × 16
²
22

Required answer = (120)² = 14400


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