Question : Directions: In the following question a series is given, with one number missing. Choose the correct alternative from the given ones that will complete the series.
6, 11, 21, 36, 56, ?
Option 1: 42
Option 2: 51
Option 3: 81
Option 4: 91
Correct Answer: 81
Solution :
Given:
6, 11, 21, 36, 56, ?
Add consecutive multiples of 5 to find the next term –
6 + 5 = 11; 11 + 10 = 21; 21 + 15 = 36; 36 + 20 = 56; 56 + 25 = 81
So, 81 is the missing number of the series. Hence, the third option is correct.
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