In how many ways 2 red pens, 3 blue pens and 4 black pens can be arranged if same color pens are indistinguishable?

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answerhappygod
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In how many ways 2 red pens, 3 blue pens and 4 black pens can be arranged if same color pens are indistinguishable?

Post by answerhappygod »

a) 362880
b) 1260
c) 24
d) 105680
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