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Odd-product fractions 1/(1x3), 1/(3x5), up to 1/(19x21) are summed. Value?
A10/19
B9/19
C10/21
D9/21
Answer & Solution
Correct answer: C. 10/21
There are 10 terms, so the sum is n/(2n + 1) = 10/21.
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