How many such matrices are there in each

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Reference no: EM132104929

In this problem, we are concerned with two dimensional arrays (matrices) that have 20 rows and 20 columns; further, each entry is a member of {1, 2, 3}.

How many such matrices are there in each of which

(a) among the 100 entries in the first 5 rows, exactly 30 are ones (and there are no other restrictions)?

(b) every row has exactly 5 ones and also exactly 5 twos?

Reference no: EM132104929

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