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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Question : Directions: Which of the following numbers will replace the question mark (?) in the given series? $96,12, \frac{3}{2}, ?, \frac{3}{128}$
Option 1: $\frac{3}{12}$
Option 2: $\frac{1}{128}$
Option 3: $\frac{3}{64}$
Option 4: $\frac{3}{16}$
Question : Directions: Which of the following numbers will replace the question mark (?) in the given series? $18,6,2, ?, \frac{2}{9}$
Option 1: $\frac{1}{3}$
Option 2: $\frac{1}{9}$
Option 3: $\frac{2}{3}$
Question : Directions: Which of the following numbers will replace the question mark (?) in the given series? $\frac{-1}{729},\frac{-1}{81},\frac{-1}{9},?$
Option 1: 1
Option 2: –1
Option 3: $\frac{-1}{3}$
Option 4: $\frac{1}{3}$
Question : Directions: Which of the following numbers will replace the question mark (?) in the given series? 4, 11, 19, 31, 52, 89, ?
Option 1: 151
Option 2: 105
Option 3: 150
Option 4: 115
Question : Directions: Which of the following numbers will replace the question mark (?) and complete the given number series? 15, 19, 21, 25, 27, ?
Option 1: 31
Option 2: 32
Option 3: 29
Option 4: 30
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