Which number would replace the question mark in the series ?
7, 12, 19, ?, 39

39

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28

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26

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24

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Solution

The correct option is C $28$
$7 + 5 = 12$
$12 + 7 = 19$
$19 + 9 = 28$
$28 + 11 = 39$
Hence '28' replace the question mark.

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