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Question 12
Which number will replace the question mark (?) in the following series?
2, 3, 8, 31, ?
Solution
Here the logic of the series is -
$$ 2 \times 2 -1=3 $$
$$ 3 \times 3 -1=8 $$
$$ 8 \times 4 -1=31 $$
So, the next one will be
$$ 31 \times 5 -1=154 $$
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