Twelve days before Christmas, Sebe planned to give his mother a Christmas gift. On the first day, he sent one gift, on the second day he sent two gifts,on the third day, three gifts and so on. How many gifts did Sebe send his mother after the 12th day? (Arithmetic Sequence)

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Answers

2016-06-26T20:44:06+08:00
Sebe sent a total of 78 gifts to his mother
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