Question 4

Select the numberthat can replace the question mark (?) in the followingseries.
5, 10, 26, ?, 122, 170

Solution

$$(2)^2 + 1$$ = 4 + 1 = 5
$$(3)^2 + 1$$ = 9 + 1 = 10
$$(5)^2 + 1$$ = 25 + 1 = 26
$$(7)^2 + 1$$ = 49 + 1 = 50
$$(11)^2 + 1$$ = 121 + 1 = 122
$$(13)^2 + 1$$ = 169 + 1 = 170
$$\therefore$$ The correct answer is option B.


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