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Sequence

Find the valu...

Question

Find the value of $^{'} ?^{'}$ in the series: $12, 17, 15, ?, 18, 23, 21, . . . .$

A

20

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B

21

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C

22

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D

24

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Solution

The correct option is A 20
The series alternates the addition of $5$ with the subtraction of $2$ .
So, the number is $20$ .

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