Choose the correct alternative from the given options that will replace the question mark (?) in the following series:
7, 8, 18, 57, ?, 1165
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 232
The terms grow faster and faster, which points to multiplication. Each term is the previous term multiplied by 1, 2, 3, … and then increased by the same number:
\(7\times1+1=8\)
\(8\times2+2=18\)
\(18\times3+3=57\)
\(57\times4+4=232\)