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Arithmetic Mean

Find the miss...

Question

Find the missing number:
$18, 21, 24, 27, . . . .$ .

32

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30

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31

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29

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Solution

The correct option is C $30$
The given numbers are in AP.
Hence they follow this $a, a + d, a + 2 d, . . . . .$ pattern
i.e. $18, 18 + 3, 21 + 3, 24 + 3, . . . . .$
$∴$ Missing number $= 27 + 3 = 30$ .

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