Question

Which term of the A.P is 3,8,13,18,.....,78​

Answer 1

Answer:

a =3

d=5

an=78

Step-by-step explanation:

an =a+n-1*d

n:16

Answer 2

Answer:

Given:-

a = 3

d = a2 - a1 = 8-3

= 5

Step-by-step explanation:

an = a + (n-1)5

78 = 3 + (n-1)5

78= 3+ 5n -5

78-3 = 5n -5

75 = 5n-5

75+5 = 5n

80/5 = n

n = 16