What will come in place of the question mark (?) in each of the following series?

17, 9, ?, 16.5, 35, 90

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None of these

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Solution

The correct option is C 10
$17 \times 0.5 + 0.5 = 9$
$9 \times 1 + 1 = 10$
$10 \times 1.5 + 1.5 = 16.5$
$16.5 \times 2 + 2 = 35$
$35 \times 2.5 + 2.5 = 90$

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