how many bit strings of length 9 have exactly two 1'S or two 0'S( this is one question, so you should have one answer)

Arne Stockmans asked Mar 5, 2023

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5 votes

Arne Stockmans asked Mar 5, 2023

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22 votes

Answer:

72.

Explanation:

Number of strings with exactly 2 1's

= 9C2

= 9*8/2*1

= 36.

Same for 2 0s

= 36.

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