Find the missing term in given series:1, 9, 25, 49, 81, ?, 169

The correct answer is Option (3) → 121

The terms are the squares of the odd numbers in order:

• \(1=1^2,\ 9=3^2,\ 25=5^2,\ 49=7^2,\ 81=9^2\)

• The next odd number is 11, so the missing term is \(11^2=121\)

• The last term, \(169=13^2\), follows it