A box contains $6$ orange, $6$ red, $6$ green, $6$ blue and $6$ yellow balls. Balls of the

Question

A box contains $6$ orange, $6$ red, $6$ green, $6$ blue and $6$ yellow balls. Balls of the same colour are considered to be indistinguishable. Find the number of ways to select $4$ distinct balls,[1] $4$ balls, of which exactly $3$ are identical,[2] $4$ balls without any restriction.[3]

Accepted Answer

(i) $5$ (ii) $20$ (iii) $70$

2015 NJC P2 Q7

2015 NJC P2 Q7

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