Question : Directions: Which of the following numbers will replace the question mark (?) in the given series?
$\frac{1}{121}, \frac{1}{11}, 1, ?, 121$
Option 1: 11
Option 2: 12
Option 3: 21
Option 4: 1
Correct Answer: 11
Solution :
Given:
$\frac{1}{121}, \frac{1}{11}, 1, ?, 121$
Multiply the previous term by 11 to obtain the next term.
$\frac{1}{121}×11=\frac{1}{11}; \frac{1}{11}×11=1; 1×11=11; 11×11=121$
So, 11 is the missing term in the series. Hence, the first option is correct.
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