Question

which term of the A.P : 3,8,13,18,.........is 78?​

Answer 1

Answer:

16th term

Step-by-step explanation:

here a is 3

d is 8-3 = 5

an = 78

formula an= a+ (n-1)d

78= 3 + ( n-1)5

hence

(78-3)/5 =n-1

75/5. +1 = n

n=16