Find common difference whose n term is 25 and an=3n+7
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The common difference is 3. It's given in the question!
For any AP, the co-efficient of n of its algebraic expression is always the common difference of the AP.
In the algebraic expression 3n+7, 3 is the co-efficient of n. ∴ 3 is the common difference.
∵ For any AP, the algebraic expression is dn + (a - d). Here, d is the common difference and a is the first term. So it is very easy to find the common difference from the algebraic expression of an AP.
Thank you. Have a nice day.
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shadowsabers03:
The AP is 10, 13, 16,......
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