There are unlimited number of identical balls of four different colours. How many arrangements of at most 8 balls in row can be made by using them?

There are unlimited number of identical balls of four different colours . How arrangements of atmost 7 balls in a row can be made by using them ?

There are unlimited number of identical balls of three different colours. How many arrangements of atmost 7 balls in a row can be made by using them?

There are unlimited number of identical balls of three different colours. How many arrangements of atmost 7 balls in a row can be made by using them?

There are unlimited number of identical balls of three different colours. How many arrangements of atmost 7 balls in a row can be made by using them?

There are unlimited number of identical balls of three different colours. How many arrangements of atmost 7 balls in a row can be made by using them? (a) 2187 (b) 343 (c) 399 (d) 3279

There are unlimited number of identical balls of three different colours. How many arrangements of atmost 7 balls in a row can be made by using them? (a) 2187 (b) 343 (c) 399 (d) 3279

There are 24 balls of 6 different sizes in a bag, there being 4 balls of each size in four different colours.In how many ways 4 balls can be selected so that they are of different colours is

There are 2 identical white balls,3 identical red balls and 4 green balls of different shades. The number of ways in which they can be arranged in a row so that atleast one ball is separated from the balls of the same colour,is