Question

In an A.P ,if a25-a20=45 then the common difference is​

Answer 1

Answer:

Let first term be a,

According to question,

a  

25

​

−a  

20

​

=45

⟹a+24d−(a+19d)=45

⟹5d=45

So,  d=9

Step-by-step explanation:

Answer 2

Answer:

T25-T20=45

a+(25-1)d-[a+(20-1)d]=45

24d-19d=45

5d=45

d=9