Question

If the 5th term of an A.P. is 9 and the 9th
is 5, then which of the following term is unity?
(A)
12th
(C)
14th
(B) 13th
(D) 15th​

Answer 1

Answer:

(A)

12th

Step-by-step explanation:

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Answer 2

Answer:

(B) 13th

Step-by-step explanation:

Given, a+4d = 9..............1

a+8d = 5..............2

Solving 1 and 2, we get d= -1

so, a= 13

so, 1 = 13 - (n-1)

=> 12=n-1

=> 13=n ans