Question

Boxes numbered 1, 2, 3, 4 and 5 are kept in a row and they which are to be filled with either a red or a blue ball, such that no two adjacent boxes can be filled with blue balls. Then, how many different arrangements are possible, given that all balls of a given colour are exactly identical in all respects ?
(a) 8 (b) 10 (c) 15 (d) 22

Answer 1

so the ans is 10 because in one box we cannot out two same colour balls ..so we have 5box so we will put 1red nd 1 blue in every box so same colour in one will not create problem