median
don steward
mathematics teaching 10 ~ 16
Tuesday, 7 December 2010
hard haitch using 1 to 7
hard haitch
use 1 to 7 so that the (four) lines of three all add up to the same number
p
rove that 4 must go in the middle and the only possible total is 12
there are three solutions but these involve switching numbers within the lines of three
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