The first term of an AP is 5, the last term is 45 and the sum is 4 | Filo
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The first term of an AP is 5, the last term is 45 and the sum is 400. Find the number of terms and the common difference.

Solution: Solution: Here, first term of AP,
Last termof AP,
Sum of AP,
We know,

So, number of terms is .
As, last term is , we can write,


So, common difference is .
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