Question : Directions: Which number will replace the question mark (?) to complete the given series?
6, 11, 21, 36, 56, ?
Option 1: 91
Option 2: 81
Option 3: 86
Option 4: 76
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Correct Answer: 81
Solution :
Given:
6, 11, 21, 36, 56, ?
Add the consecutive multiples of 5 to the previous term to obtain the next term in the series.
6 + 5 = 11; 11+ 10 = 21; 21 + 15 = 36; 36 + 20 = 56; 56 + 25 = 81
So, 81 is the missing number in the series. Hence, the second option is correct.
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