Question

124, 112, 420, 1488, 176 ?

• A. 1640
• B. 7140
• C. 1440
• D. 980
• E. none of these

Answer 1

The correct option is B 7140

Given pattern,

$124,112,420,1488,176?$

The correct pattern is,

$124,112,176,420,1488,?$

Now, consider,

$124\times 1-12\times 1^2=112$

$112\times 2-12\times 2^2=176$

$176\times 3-12\times 3^2=420$

$420\times 4-12\times 4^2=1488$

$1488\times 5-12\times 5^2=7140$

Therefore, option $B$ is correct.