4. How many terms of the AP:9.17.25.... must be taken to give a sum of 636?
5. 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.
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Step-by-step explanation:
you can follow the steps given in sol and find value of 10 by that quadratic equation thank you ....
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hope this will help u......
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