Find the missing number.
$1, 5, 14, 30,__, 91.$

45

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55

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46

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60

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Solution

The correct option is A $55$
Given series is $1, 5, 14, 30,__, 91.$
Here $5 - 1 = 4$
$14 - 5 = 9$
$30 - 14 = 16$
Next difference is of $25.$
$30 + 25 = 55$
$91 - 55 = 36$
Hence, the missing number is $55$ .

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