Which number should replace the question mark ?
$3, 8, 13, 24, 41, ?$

65

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75

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70

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80

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Solution

The correct option is B $70$
The sequence in the series is (number + next number) + addition of natural number increasing by $1$ at each step.

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Similar questions

336, 210, 120, ?, 24, 6, 0

1, 1, 2, 4, 3, 27, 4, ?, ?

08 : 28 :: (?) : 65

Maths marks	$60 - 65$	$65 - 70$	$70 - 75$	$75 - 80$	$80 - 85$	$85 - 90$	$90 - 95$
No. of students	$8$	$12$	$14$	$8$	$5$	$6$	$4$

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