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OpenStudy (liliakarina):
How many numbers of 4 digits can be formed out of {6,9}?
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OpenStudy (anonymous):
choice of two numbers in each of 4 spots so by the "counting principle' you have \[2\times 2\times 2\times2=2^4=16\] choices
OpenStudy (amistre64):
its binomial in nature i think
OpenStudy (amistre64):
6666 6669 6696 6966 9666 6699 6969 9669 etc
OpenStudy (amistre64):
16 sounds good tho :)
OpenStudy (liliakarina):
So, 16 choices. Thanks
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OpenStudy (anonymous):
nine down, seven to go...
OpenStudy (amistre64):
1+4+6+4+1 = 2+8+6 .... yeah, 16
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