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Home » The first and last terms of an AP are 5 and 45 respectively. If the sum of all its terms is 400, find the common difference and the number of terms.
The first and last terms of an AP are 5 and 45 respectively. If the sum of all its terms is 400, find the common difference and the number of terms.
Arithmetic Progression | CBSE | Class 10 | Maths | RS Aggarwal
The first and last terms of an AP are 5 and 45 respectively. If the sum of all its terms is 400, find the common difference and the number of terms.

Solution:

Suppose that a is the first term, d is the common difference, then we have:

 

i

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