Question 21

Select the correct option that will fill in the blank and complete the series.
12, 12, 13, 26, 28, 84, ?

Solution

$$ 12, 12, 13, 26, 28, 84, ....$$

$$ 12 \times 12 = 12 $$

$$ 12 + 1 = 13 $$

$$ 13 \times 2 = 26 $$

$$ 26 + 2 = 28 $$

$$ 28 \times 3 = 84 $$

$$ 84 + 3 = 87 $$

Hence $$87 $$ is correct Answer.

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