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Concrete mathematics : a foundation for computer science

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8.5 HASHING 401<br />

The probability that hi = hn+l is 1 /m, <strong>for</strong> 1 < j 6 n; so it follows that<br />

EP = E[hl=~+l]+E[h~=hh,+,]+...tE[h,=h,+,] = ;.<br />

Maybe we should do that more slowly: Let Xj be the random variable<br />

ThenP=X1+...+X,,andEXj=l/m<strong>for</strong>allj

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