Asked by dennyelle

A clock strikes once when the hour hand is at 1, twice when the hour hand is at 2, and so on. How many times has the clock struck after 7 hours (including the 7th hour strikes)?

help!
Answered by mr.aizawa
solve it yourself kid
Answered by oobleck
7/2 (2*1 + 6*1) = 28
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