1.

Answer these questions independently of each other. In how many ways can 12 soldiers stand in three queue such that one queue has 3 soldiers, another queue has 4 soldiers and so the remaining rows has 5 soldiers?

Answer»

`^12P_5xx^7P_4xx^3P_3`
`^12P_3xx^9P_4xx^5P_5`
`^12P_3xx^9P_4xx^5P_5xx3!`
`^12P_3xx^12P_4xx13P_5xx3!`

ANSWER :C


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