Question : Directions: Which of the following numbers will replace the question mark (?) in the given series?
16, 21, 31, 46, 66, 91, ?
Option 1: 243
Option 2: 121
Option 3: 211
Option 4: 112
Correct Answer: 121
Solution :
Given:
16, 21, 31, 46, 66, 91, ?
In the above-given series, add consecutive multiples of 5 to the previous number to get the next number.
16 + 5 = 21; 21 + 10 = 31; 31 + 15 = 46; 46 + 20 = 66; 66 +25 = 91; 91 + 30 = 121
So, the missing number of the series is 121. Hence, the second option is correct.
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