luisz
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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punnus
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sum of n terms (first+last)*n/2
average of n terms is (first+last)/2

luisz
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wait

luisz
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so

luisz
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50+1

luisz
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51

luisz
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/2

punnus
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yes

luisz
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25.5?

luisz
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is that all?

punnus
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yes The sum of first 50 terms inclusive is an Arithmetic progression

luisz
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ahh

luisz
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ty