find: $3, 6, 21, 28, 55, 66, ?, 120$

103

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104

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108

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106

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105

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Solution

The correct option is C $105$
$3 \times 1 = 3$
$3 \times 2 = 14$
$7 \times 3 = 21$
$7 \times 4 = 28$
$11 \times 5 = 55$
$11 \times 6 = 66$

So, the next number is 15.
$\Rightarrow 15 \times 7 = 105$
$15 \times 8 = 120$

The series:- $3, 6, 21, 28, 55, 66, 105, 120$

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find: 3,6,21,28,55,66,?,120

The correct option is C 1053×1=33×2=147×3=217×4=2811×5=5511×6=66So, the next number is 15.⇒15×7=10515×8=120The series:- 3,6,21,28,55,66,105,120

find: $3, 6, 21, 28, 55, 66, ?, 120$

The correct option is C $105$
$3 \times 1 = 3$
$3 \times 2 = 14$
$7 \times 3 = 21$
$7 \times 4 = 28$
$11 \times 5 = 55$
$11 \times 6 = 66$

So, the next number is 15.
$\Rightarrow 15 \times 7 = 105$
$15 \times 8 = 120$

The series:- $3, 6, 21, 28, 55, 66, 105, 120$