Question

If the first term of AP is a second term is b and last term is c then find total no of terms in an ap

Answer 1

An= a+(n-1)d put this formula you will get your answeryour answer
hope it helps

Answer 2

Let An = c
Given , First term =a
Common difference = d
Now,

An = a + ( n -1 ) d
=> c = a + (n - 1 ) b - a
=> a + bn - b - an + a = c
=> bn - an + 2a - b = c
=> n( b - a ) = b + c - 2a
=> n = b + c - 2a / b-a

Hope it helps ...

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