Question

in an a.p if a=7.2 ,an=7.2, d=3.6 then find the value of n

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Answer 1

Answer:

an = a+(n-1)d

7.2 = 7.2+(n-1)3.6

(n-1)3.6 = 0

3.6n-3.6 = 0

3.6n = 3.6

n = 3.6/3.6

n = 1

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Answer 2

We know

an = a + (n-1) × d

7.2 = 7.2 + (n-1) × 3.6

=> 7.2 = 7.2 + 3.6n - 3.6

=> 7.2 = 3.6 + 3.6n

=> 7.2 - 3.6 = 3.6n

=> 3.6 = 3.6n

=> n = 3.6/3.6

=> n = 1

Hope it helps...

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