Which is the biggest number ?

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A1/2

B3/4

C13/14

D21/22

Answer:

If the difference between numerator and denominator is same then the fraction with highest values will be big number So here : 21/22 is the big one

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$\frac{1}{3\times5}+\frac{1}{5\times7}+......+\frac{1}{13\times15}=?$