## Realated Questions

A box contains 4 red, 3 white and 2 blue balls. Three balls are drawn at random. Find out the number of ways of selecting the balls of different colours?

The 288

^{th}term of the series a, b, b, c, c, c, d, d, d, d, e, e, e, e, e, f, f, f, f, f, f…. isThe infinite sum 1?+4 / 7+?9 / 7

^{2}+?16 / 7^{3}? 25 / 7^{4}? .... equals