Question : Directions: In the following question, select the missing number of the given series.
500, 497, 488, 461, 380, ?
Option 1: 130
Option 2: 137
Option 3: 140
Option 4: 141
Correct Answer: 137
Solution :
Given:
500, 497, 488, 461, 380, ?
In the above-given series, subtract 3, 9, 27, 81 and 243 from the numbers.
500 – 3 = 497
497 – (3 × 3) = 497 – 9 = 488
488 – (9 × 3) = 488 – 27 = 461
461 – (27 × 3) = 461 – 81 = 380
380 – (81 × 3) = 380 – 243 = 137
So, 137 is the missing number of the series. Hence, the second option is correct.
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