Question : Directions: In the following question, select the missing number of the given series.
100, 105, 92, 113, 84, ?
Option 1: 118
Option 2: 122
Option 3: 121
Option 4: 120
Correct Answer: 121
Solution :
Given:
100, 105, 92, 113, 84, ?
In the above-given series, add and subtract alternately, the natural numbers with the difference of 8 to the numbers.
100 + 5 = 105;
105 – (5 + 8) = 105 – 13 = 92;
92 + (13 + 8) = 92 + 21 = 113;
113 – (21 + 8) = 113 – 29 = 84;
84 + (29 + 8) = 84 + 37 = 121
So, 121 is the missing number. Hence, the third option is correct.
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