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At a blood​ drive, 4 donors with type O+​blood,4donors with type A plus+​blood, and2 donors with...

At a blood​ drive, 4 donors with type O+​blood,4donors with type A plus+​blood, and2 donors with type B plus+blood are in line.

In how many distinguishable ways can the donors be in​ line?

A permutation is an ordered arrangement in which r objects are chosen from n distinct​ (different) objects and repetition is not allowed.

Find in how many different ways the donors can be in line.

I don't know how they solve the last step: 10!/4!*4!*2!*+3150 How are they getting this answer?

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