'how to find the number of possible pattern?

1.7 In Time Division Multiple Access (TDMA) communication, a time frame is divided into ten time slots such that each time slot can be used by any user. Suppose that a frame is received that contains three packets due to user 1, two due to user 2, and the rest of the time slots were empty. How many frame patterns are possible?

here we have 10 time slot to be fill by using 3 packet from user-1 2 packet from user-2

the rest 5 frame slot will be empty ? so what will be the total patterns

permutation


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