There are 6 persons of whom 3 are Asians...

There are 6 persons of whom 3 are Asians, 2 Europeans and 1 American. They have to stand in a line for a photograph so that the three Asians are together and the two Europeans are together. In how many ways can this be done?

A

3!xx2!xx1!

B

3!xx3!xx2!xx1!

C

3!xx3!xx1!

D

3!xx2!xx2!xx1!

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