Find the missing number:
$11, 13, 17, 19, ?, 25$

20

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21

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23

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22

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Solution

The correct option is B $23$
Option C is the correct answer
Explanation
It is addition series in which 2 and 4 are added alternatively
11+2 $=$ 13
13+4 $=$ 17
17+2 $=$ 19
19+4 $=$ 23
23+2 $=$ 25
Hence 23 is correct answer.

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