Question

priya gets rupees 200 as pocket money .everyday she earn Rupees 15 and add it to her pocket money .if we continue it for 10 days how much pocket money will see collect

Answer 1

sum of nth term
$\frac{n}{2} (2a + (n - 1)d)$
Ap will be formed
200,215,230.......…....
here,
a=200 & d=15
$= \frac{10}{2} (2 \times 200(10 - 1)15) \\ 5(200 + 9 \times 15) \\ 5(200 + 135) \\ 5 \times 335 \\ 1675ans$