Find the wrong term in the series given below: 15, 16, 22, 29, 45,...

Given series is, $15,16,22,29,45,70, \ldots$ The difference between two terms of the series, $$\begin{aligned} & \Rightarrow 16-15=1=1^2 \\ & \Rightarrow 22-16=6=\text { Not a square term } \\ & \Rightarrow 29-22=7=\text { Not a square term } \\ & \Rightarrow 45-29=16=4^2 \\ & \Rightarrow 70-45=25=5^2 \end{aligned}$$ Here, difference of terms is a perfect apart from 6 and 7. Also, this difference is increasing with value 1. So, there is difference of $1^2, 2^2, 3^2, 4^2$ and $5^2$ among the terms. By this difference, the new numbers of series we get, $7{ }_{70}^{15+1^2=16 \Rightarrow 16+2^2=20 \Rightarrow 20+3^2=29 \Rightarrow 29+4^2=45 \Rightarrow 45+5^2=. ~}$ Here, 20 should come in the series in place of 22. So, the wrong term in the series is 22 . Hence, the correct option is 1.