Question

9. Which term of AP 3, 8, 13, 18,
is 78?
po
(A) Toth
O YB) 12th
O (C) 7 th
O D
(D) 76th​

Answer 1

Answer:

16th term

Step-by-step explanation:

a=3,d=5

so 78=a+(n-1)d where n =?

78=3+(n-1)5

78=3+5n-5

78=-2+5n

80=5n

n=16