Question

If the sum of first 10 terms of an ap is _60 sum of first 15 terms is _165 find sum of its n terms​

Answer 1

Answer:

60 + (-100) + 300

= 60 -100 + 300

= 360 - 100

= 260

Answer 2

Answer:

$= {n}^{2} - 4n$

Explanation:

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