Given four flags of different colours, how many different signals can be generated if each signal requires to use of 3 flags. One below the other ?

(i) A mobile phone has a passcode of 6 digits. What is the maximum number of attempts one makes to retrieve the passed. (ii) Given four flags of different colours, how many different signals can be generated if each signal requires the use three flags, One below the other?

Given 5 flags of different colours,how many different signals can be generated if each signal requires the use of 2 flags,one below the other?

Given 5 flags of different colours, how many different signals can be generated if each signal requires the use of 2 flags, one below the other?

Given 5 flags of different colours, how many different signals can be generated if each signal requires the use of 2 flags, one below the other ?

Given 5 flags of different colours, how many different signals can be generated if each signal requires the use of 2 flags, one below the other?

Given 5 flags of different colours, how many different signals can be generated if each signal requires the use of 2 flags, one below the other?