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)
1 answer:
Answer:
72.
Step-by-step explanation:
Number of strings with exactly 2 1's
= 9C2
= 9*8/2*1
= 36.
Same for 2 0s
= 36.
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