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OpenStudy (anonymous):
Abe has a bag of marbles and wants to divide them into sets. The first set wull have 2 marbles the second 5 the third 8 and the fourth 11. How many sets will he have if he starts with 40marbles?
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OpenStudy (jh3power):
so if it's nth set, it is 3n-1 marbles in it...
OpenStudy (anonymous):
A. 4 B. 5 C. 6 D. 7 E. 8 are my choices
OpenStudy (jh3power):
n(n+1)/2 *3 -1 =40 3/2n^2+3/2n-1=40...
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