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Throughput = efficiency X bandwidth ----------- 1

as we know that efficiency of slotted aloha is .368 and throughput is nothing but how many bits are sent in per second.

then throughput of each station = $\frac{500}{5000 X 10^{-3}} = 100  bit/second$

for N station = N * 100 bit/second

 put it 1,

N * 100 = .368 * 50 * $10^{3}$

N = 184