Ashish is given Rs 158 in one rupee denomination. He has been asked to allocate them into a number of bags such that any amount required between Re 1 and Rs 158 can be given by handing out a certain number of bags without opening them. What is the minimum number of bags required

A new flag is to be designed with six vertical stripes using some or all of the colours yellow, green, blue and red. Then, the number of ways this can be done such that no two adjacent stripes have the same colour is

There are n boxes, each of which contains several coins of denominations Rel, Rs.2, Rs.3, Rs.4 and Rs.5. If exactly 10 coins are randomly drawn from each of the boxes, then fmd the minimum possible value of n such that at least eight coins of the same denomination arc obtained on the whole.