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Algebra
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OpenStudy (anonymous):
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OpenStudy (anonymous):
OpenStudy (reemii):
for 1 person? for 2 ? for 3? draw lines to find out the answer for small number of ppl. |dw:1399934221632:dw| for n=4, 6 handshakes. look carefully at the sequence of numbers. what numbers do you count for small n?
OpenStudy (anonymous):
1=0 2=1 3=3 4=6 5=10 6=15 I can't figure out a formula
OpenStudy (reemii):
so far it's correct. what do you add from one number to the next?
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