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OpenStudy (anonymous):
how many strictly increasing sequences of positive integers begin with 1 and end with 7? Two such sequences are 1,7 and 1,4,6,7.
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OpenStudy (mathmate):
1 and 7 have to be there, we can add or subtract any number in between, so The cardinality of the power set of {2,3,4,5,6}, which is 2^5=32
OpenStudy (anonymous):
oic
OpenStudy (anonymous):
thx
OpenStudy (mathmate):
You're welcome! :)
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