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CalCDanG
06.10.2019 •
Mathematics
What is the answer to 2+1/6y=3x+4
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Ответ:
Case B = there are 9 zeros and 1 one
Case C = there are 8 zeros and 2 ones
Case D = there are 7 zeros and 3 ones
Case E = there are 6 zeros and 4 ones
Any other case isn't possible since we want more 0s than 1s
For case A, we have 10 C 0 = 1 way to do this which is just a string of 0s, which is length 10. The notation 10 C 0 refers to the n C r combination formula.
For case B, we have 10 C 1 = 10 ways to do this. Simply move the lone 1 to be placed at each slot giving 10 different combinations.
For case C, we have 45 different combos because 10 C 2 = 45.
Case D has 120 different outcomes (note how 10 C 3 = 120)
Case E has 210 different outcomes (10 C 4 = 210)
As a shortcut, you can look at Pascal's triangle. Look at the row that starts with 1, 10, 45, ... and record the first 5 values. Those values match up with the results we got.
Now add up those results to get: 1+10+45+120+210 = 386
Therefore, the final answer is 386. There are 386 different bit strings of length 10 that has more 0s than 1s.