Question

aif last term of A.P is 3n+7 then what is common difference ?

Answer 1

Answer:

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an = 3n+ 7

put n=1

a1= 3(1)+7=10

a2=3(2)+7=13

a3=3(3)+7=16

d = a2-a1 = 13-10=3

Answer 2

l= 3n+7

d=?

Let total number be n

t=l-(n-1) d

n=3n+7-(n-1) d

n=3n+7-nd+d

n-3n=d-nd

-2n=d(1-n)

-d=2n/(1-n)

d=2n/(1-n)