Question

Q5. If 7 times the 7th term of an AP is equal to
11 times its 11th term, then its 18th term will
be
(A) 7 (B) 11 (C) 18 (D) O​

Answer 1

Answer:

0

Step-by-step explanation:

7th term=  a+6d

11th term = a +10d

By statement=

7{a+6d}=11{a+10d}

7a+42d=11a+110d

4a+68d=0

By dividing by 4

a+17d=0

18th term=?

a+17d=0

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Answer 2

Answer:

here is your answer mate

Step-by-step explanation:

WE can see that : 7×T  

7

​  

=11×T  

11

​  

 

7(a+6d)=11(a+10d)

7a+42d=11a+110d

7a−11a=110d−42d

−4a=68d

∴a=−17d

Consider, T  

18

​  

=a+17d=−17d+17d∴T  

18

​  

=0