calculate standard deviation for 39,40,41,42,43,44,45,46,47,48
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If , ,
a b c are three distinct real numbers then the equation
()()()()()()
xbxcxcxaxaxb
2222
abcx
0 has
()()()()()()
abacbcbacacb
(A) exactly one root(B) exactly two roots(C) no root(D) None of these
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