Yet another GMAT Hack:
What is the mean of the numbers on an arithmetic series a, a+d, ...., a+(n*d)
If we take the last numbers as l,
then the mean = (a + l)/2.
Nifty Huh?!
What is the mean of the numbers on an arithmetic series a, a+d, ...., a+(n*d)
If we take the last numbers as l,
then the mean = (a + l)/2.
Nifty Huh?!
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