Mouth watering ice creams and mind watering problems-1

Sanjeet Raria owns a shop selling ice creams for pleasing you in the hot summer days. He has 6 different flavors of ice creams assuming each ice cream is of only one problem. You go to his shop to buy 4 ice creams, in how many ways can you choose the ice creams such that all the ice creams are of different flavors.

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