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Summation by Sigma Method

Find the miss...

Question

Find the missing number:
$9, 18, 36, ?, 144$ .

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Solution

The series given is
$9, 9 \times 2$ , $18 \times 2$ , $36 \times 2$ , $72 \times 2$
$= 36 \times 2$
$= 72$
Answer is $72$

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