Question

Q.13

Answer 1

Let there be n terms in given A.P. 

`" First term"=a=-4`

`"Last term"=I=29`

`"Sum of n terms" =S_n=150`

`⇒ n/2(a+I)=150`

`⇒nxx25=300`

`⇒n=12`

Now, last term=`t_n=29`

`⇒ t_12=29`

`⇒ a+11d=29`

`⇒-4+11d=29`

`⇒11d=33`

`⇒d=3`

Hence, the common diffreance is 3.