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A builder adds the squares of the odd numbers 1, 3, 5, 7, 9. Find the sum.
A165
B155
C225
D175
Answer & Solution
Correct answer: A. 165
With n = 5 the formula n(2n - 1)(2n + 1)/3 gives 5 x 9 x 11 / 3 = 165, matching 1 + 9 + 25 + 49 + 81.
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