Four discs in two colours and in four sizes are placed in any order on either of

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Four discs in two colours and in four sizes are placed in any order on either of two sticks. The following illustration shows one possible arrangement of the four discs.


a. Find the number of ways in which the four discs can be arranged so that:

i. They are all on the same stick

ii. There are two discs on each stick.

b. In how many ways can the discs be placed if there are no restrictions?

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