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Find the sum: 2×1^2 +4×2^2 +6×3^ +⋯+20×10^2
  1. 76,440
  2. 77,000
  3. 77,440
  4. 6050
Explanation

Given:

Write the terms as:

Using the formula:

1^3+2^3+cdots+n^3=left[frac{n(n+1)}{2}right]^2

For :

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