Question

Rahul invests Rs 10 on first day and increases the investment by Rs 2 per day, then
his total collection after 10 days is

Answer 1

Answer:

$first \: term \: of \: a.p.(a) = 10 \\ difference(d) = 2 \\ number \: of \: terms(n) = 10 \\ formula \colon \: s = \frac{n}{2} (2a + (n - 1)d) \\ = \frac{10}{2}(2 \times 10 + (10 - 1)2) \\ = 5(20 + (9)2) \\ = 5(20 + 18) \\ = 5 \times 38 \\ = 190 \\ \purple{ \fbox{ \red{total \: collection \: after \: 10 \: days = rs.190}}}$

Mark my answer as Brainliest.