Complete the series by finding the missing term from the given alternatives.
$1, 1, 2, 4, 7, 11, 16, ?$

20

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21

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22

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23

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Solution

The correct option is D $22$
The series is obtained by adding $0, 1, 2, 3.....$ to the previous term respectively.
$1 + 0 = 1$
$1 + 1 = 2$
$2 + 2 = 4$
$4 + 3 = 7$
$7 + 4 = 11$
$11 + 5 = 16$
$16 + 6 = 22$
Hence $22$ replaces the question mark.

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