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  1. Suppose there are 4 nodes N1, N2, N3 and N4 are using a slotted ALOHA channel to send their own huge data. When competing all the nodes to transfer their data only one node will get succeeded with a probability P. The time is divided into slots S1, S2, S3 ….and so on. What is probability of N1 succeeded in slot 5?
    1.   4*(1-P)3(P(1-P)3)
    2.   P(1-P)3(1-P(1-P)3)
    3.   P(1-P)3(1-P(1-P)3)4
    4.   4*P(1-P)3(1-P3(1-P)3)

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HERE,it is not mentioned that N1 succeds for the first time in slot 5.so it can succeed in earlier slots as weel.

so,acc to ne answer should be

(4C1 * p * (1-p)3)4 * p*(1-p)3

(4C1 * p * (1-p)3)4  is because in first 4 slots ,any one can succeed and p*(1-p) for success of N1 in slot 5

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