Choose the correct alternative that will continue the same pattern.
1, 1, 4, 7, 22, 43, ?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 130
Each term comes from the one before it by two steps used in turn: multiply by 2 and subtract 1, then multiply by 3 and add 1.
\(1\times2-1=1\)
\(1\times3+1=4\)
\(4\times2-1=7\)
\(7\times3+1=22\)
\(22\times2-1=43\)
Next comes the \(\times3+1\) step: \(43\times3+1=130\)