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Let n quantities be in A.P., d being the...

Let n quantities be in A.P., d being the common difference. Let the arithmetic mean of the squares of these quantities exceed the square of the arithmetic mean of these quantities by a quantity p. Then p

A

is always negative

B

equals `(n^(2)- 1)/(12) d^(2)`

C

equal s`(d^(2))/(12)`

D

equals `(n^(2) - 1)/(12)`

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The correct Answer is:
A
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