Question

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

124, 112, 176, 420, 1488, ?

• A. 3568
• B. 7140
• C. 5712
• D. 6150
• E. None of these

Answer 1

The correct option is B

7140

The pattern of the series is:
124 × 1 - 12 $\times$ $1^2$ = 112
112 $\times$ 2 - 12 $\times$ $2^2$ = 176
176 $\times$ 3 - 12 $\times$ $3^2$ = 420
420 $\times$ 4 - 12 $\times$ $4^2$ = 1488
1488 $\times$ 5 - 12 $\times$ $5^2$ = 7140