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Sum of N Terms of an AP

Which number ...

Question

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

A

24

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B

31

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C

28

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D

26

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Solution

The correct option is C 28
In the series 7, 12 , 19 , ? , 39
The pattern followed is:
$\to$ 7 + 5 = 12
$\to$ 12 + 7 = 19
$\to$ 19 + 9 = 28
$\to$ 28 +11 = 39
So, the missing Number = 19+9 = 28

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