Question

In an ap a=7 ,d=3 , nth term is 28 ,find n

Answer 1

Answer:

n=8

Step-by-step explanation:

Given:a=7,d=3,an=28

To find:n=?

Solution:

an=a+(n-1)d

28=7+(n-1)3

28-7=(n-1)3

21=3n-3

21-3=3n

24=3n

24/3=n

8=n

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