A) 24
B) 120
C) 0
D) None of these
Correct Answer: C
Solution :
Let the first term of A.P. is a and common difference is d. 11th term of A.P. = \[a+10d\] 21st term of A.P. = a+ 20d \[2(a+10d)=7(a+20d)\]Þ\[2a+20d=7a+140d\] \[5a+120d=0\]Þ\[a+24d=0\] Hence 25th term is 0.You need to login to perform this action.
You will be redirected in
3 sec