No. of different garlands using 3 flowers of one kind and 12 flowers of seconds kind is

The number of different garlands,that can be formed using 3 flowers of first kind and 3 flowers of second kind,is

Number of different garlands that can be made using 5 flowers of one kind,3 flowers of another kind is -

Opening and closing of flowers represent a kind of

Opening and closing of flowers represent a kind of

Opening and closing of flowers represent a kind of

Opening and closing of flowers represent a kind of

The number of ways of selecting ' n ' things out of '3n ' things of which 'n ' are of one kind and alike and 'n ' are of second kind and alike and the rest unlike is :

The number of ways of selecting ' n ' things out of '3n ' things of which 'n ' are of one kind and alike and 'n ' are of second kind and alike and the rest unlike is :

The number of ways in which 7 different coloured flowers be string in the form of a garland is