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Mathematics 23 Online
OpenStudy (anonymous):

If Tom and Jane have fifteen books on the shelf and each is taking one down to read, how many potential choices do the two of them have?

OpenStudy (anonymous):

this problem is frustrating me

OpenStudy (anonymous):

Tom has 15 choices, then Jane is left with 14 choices since Tom took one. 15 * 14 = 210

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