Question

Q.1

Answer 1

`n^(th) "term of an A.P."=t_n=15-7n`

^{`⇒" first term"=t_1=15-7xx1=15-7=8`}

`"Second term" =t_2=15-7xx2=15-14=1`

`∴ "Common difference"=t_2-t_1=1-8=-7`