A) 90
B) 80
C) 100
D) None of these
Correct Answer: A
Solution :
\[\left( 1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}+\frac{1}{8}-\frac{1}{9}+\frac{1}{9}-\frac{1}{10} \right)=\frac{p}{q}\] \[\therefore \frac{p}{q}=\left( 1-\frac{1}{10} \right)=\frac{9}{10}\] \[\therefore p\times q=9\times 10=90\]You need to login to perform this action.
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