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OpenStudy (anonymous):
What is the average(arithmetic mean) of the positive integers from 1 to 50, inclusive? Note: please tell the shortcut for this PSAT question.
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OpenStudy (anonymous):
sum of n terms (first+last)*n/2 average of n terms is (first+last)/2
OpenStudy (anonymous):
wait
OpenStudy (anonymous):
so
OpenStudy (anonymous):
50+1
OpenStudy (anonymous):
51
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OpenStudy (anonymous):
/2
OpenStudy (anonymous):
yes
OpenStudy (anonymous):
25.5?
OpenStudy (anonymous):
is that all?
OpenStudy (anonymous):
yes The sum of first 50 terms inclusive is an Arithmetic progression
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OpenStudy (anonymous):
ahh
OpenStudy (anonymous):
ty
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