12. Five marks exercise problems VII

1. The ratio of \(6^{\text{th}}\) and \(8^{\text{th}}\) term of an \(A.P.\) is \(7:9\). Find the ratio of \(9^{\text{th}}\) term to \(13^{\text{th}}\) term.

 

The required ratio is \(:\)

 

 

2. Find the \(12^{th}\) term from the last term of the \(A.P\) \(-2\), \(-4\), \(-6\), … \(-100\).

 

The \(12^{th}\) term from the last term of the \(A.P\) \(=\)