Question

Ammu has a saving box. she deposit 1 Rs in the first day, 2 Rs in the second day and 3 Rs in the third day and so on. After some more days she find 171 Rs in the box. how many days she take for the total deposit​

Answer 1

Answer:

18

By a trial and error method..

Answer 2

For this AP

171=1+2+3+4+5+6+7+

+8+10+11+12+13+14+15+16+17+18

So 18 days are required for total deposit