Question

IF (2n +3) is the nth

term of an A.P. find

(1) First term

(2) Common difference

(3) 15th

term

(4) Sum of 15 terms​

Answer 1

Answer:

nth term is 2n+3

first term is

n=1

2+3= 5

a1= 5

for commen difference first find second term

a2= 7

a2-a1= common difference

7-5= 2

a15= a+(n-1)d

=5+14×2

= 33