Question

If for an A.P. the first term is $11$ and the common difference is $-2$, then find first three therms of A.P.

Answer 1

Given, first term, $a=11$
Common difference, $d=-2$
We know that, $t_n=a+(n-1)d$
$t_1=a=11$
$t_2=a+d=11+(-2)=9$
$t_3=a+2d=11+2(-2)=7$
Thus, first three terms are $11,9$ and $7$.