plz answer 11th and 13th questions ....on the paper plz ....its urgent ....tomorrow i have pt2 exam ...so plz help me .
wrong answer will be reported ...
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13.here an=0
an=a+(n-1)D
difference=-(3)
a=21
0=21+(n-1)-3
-21=-3n+3
-21-3=-3n
-24=-3n
24=3n
24/3=n
n=8
18th term of A.P. is zero
an=a+(n-1)D
difference=-(3)
a=21
0=21+(n-1)-3
-21=-3n+3
-21-3=-3n
-24=-3n
24=3n
24/3=n
n=8
18th term of A.P. is zero
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