Question

4. Which term of the AP:3, 8, 13, 18,...,is 78?
5. Find the number of terms in each of the following APs :
7,13, 19, ..., 205
(1) 18,155,13,...,-47​

Answer 1

Step-by-step explanation:

4. a=3

d=5

n=78

an=a+(n-1)d

an=3+(78-1)5

an=3+77×5

an=3+385

an=388