3. A bit string is a finite sequence of 0’s and 1’s. For this problem, you may leave your answers unreduced. (a) How many bit strings of length 15 contain exactly six zeros? (b) How many bit strings of length 9 consists of at least four ones

Algebra & Trigonometry with Analytic Geometry
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ISBN:9781133382119
Author:Swokowski
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Chapter10: Sequences, Series, And Probability
Section10.1: Infinite Sequences And Summation Notation
Problem 16E
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3. A bit string is a finite sequence of 0’s and 1’s. For this problem, you may leave your answers unreduced.

(a) How many bit strings of length 15 contain exactly six zeros?

(b) How many bit strings of length 9 consists of at least four ones?

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