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The sum of cubes 1 to n equals [n(n + 1)/2] squared. What is 1 cubed to 6 cubed?
A441
B456
C361
D400
Answer & Solution
Correct answer: A. 441
For n = 6 the sum is (6 times 7 divided by 2) squared, which is 21 squared, or 441.
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