There is an unlimited stock of blue ,red, white and grey coloured ball. The balls of each colour are identical.find the number of ways of selecting 12 balls from the stock?
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Answer:
455
Step-by-step explanation:
Assume there are 12 balls of each colour and these are not unlimited. Then the total balls are 48. Now apply multiset formula as it is the number of multisets of length k on n symbols.
[(nK)]
Here, n=12, k=4
Number of multisets=
n+k-1 C k-1 = n+k-1Cn
=12+14-1 C12=15C12
=13×14×15÷6= 13×7×5= 455
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