Find the missing number:
$7, 19, 55, 163, ?$

387

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329

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527

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487

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Solution

The correct option is D $487$
Option (D) is the correct answer
Explanation:
In the following series the first number is multiplied by 3 and subtracted by 2 to form next number
$7 \times 3 - 2 = 21 - 2 = 19$
$19 \times 3 - 2 = 57 - 2 = 55$
$55 \times 3 - 2 = 165 - 2 = 163$
$163 \times 3 - 2 = 489 - 2 = 487$
Hence $487$ is the correct answer.

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