Question

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

Answer 1

Step-by-step explanation:

an=78

a=3

d= 8-3

= 5

an= a+(n-1)d

78= 3+(n-1)5

78=3+5n-5

78=5n - 2

78+2 = 5n

80 =5ñ

n= 80/5

n= 36

therefore 78 is 36th term of given AP

Answer 2

Answer:

16

Step-by-step explanation:

an is 78 a=3and d=5put the value in formula. an =a +(n-1)d