Question: Recall that a 9 - bit string is a bit strings of length 9 , and a bit string of weight 3 , say, is

Recall that a 9-bit string is a bit strings of length 9, and a bit string of weight 3, say, is one with exactly three 1s.
How many 9-bit strings are there?
How many 9-bit strings have weight 0?
How many 9-bit strings have weight 1?
How many 9-bit strings have weight 4?
How many 9-bit strings have weight 8?
How many 9-bit strings have weight 9?
How many 9-bit strings have weight 15?

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