Question

Q no 8
Be quick because I have exam tomorrow ...
Plz provide correct solution

Answer 1

$hey \: bro \: \: here \: is \: your \: \: \\ answer \: \\ a(p) = \frac{1}{7} (2p - 1) \\ a(1) = \frac{1}{7} \\ common \: difference \: \\ d \: = a(2) - a(1) = \frac{3}{7} - \frac{1}{7} = \frac{2}{7} \\ s(n) = \frac{n}{2} (2 a(1) + (n - 1)d) \\ \: \: \: \: \: \: \: \: \: \: = \frac{n}{2} (2 \times \frac{1}{7} + (n - 1) \frac{2}{7} ) \\ \: \: \: \: \: \: \: \: \: \: \: = \frac{n}{2} ( \frac{2n}{7} ) \\ \: \: \: \: \: \: \ \: \: \: \: = \frac{ {n}^{2} }{7} \\ \\ hope \: you \: understand \: my \: answer.$