In a compressed data file of 10,000 bytes, each byte is equally likely to be any one

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In a compressed data file of 10,000 bytes, each byte is equally likely to be any one of 256 possible characters b0,.........., b255 independent of any other byte. In Ni is the number of times bi appear in the file, find the joint PMF of N0,...................,N255. Also what is the joint PMF of N0 and N1?
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