Question

in a certain ap five time the fifth term is equal to eight time the eight term. then it 13 term is step by step explain? ​

Answer 1

Answer:

Given 5 times 5 th

term 8 times 8 th term

5(a+(5−1)d)=8(a+(8−1)d) ......... [ tn]

=a+(n−1)d ]

5a+20d=8a+56d

⇒3a+36d=0

∴a+12d=0

Comparing this with a+(n−1)d,

we get ,n−1=12

n=13th term

Hence, 13 th

term is zero.