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If a, b and c real numbers such that a^(...

If a, b and c real numbers such that `a^(2) + b^(2) + c^(2)` = 1, then ab + bc + ca lies in the interval :

A

`[ (1)/(2) , 2] `

B

[ - 1, 2 ]

C

`[ - (1)/(2) , 1 ]`

D

`[ - 1 , (1)/(2) ] `

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The correct Answer is:
C
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MODERN PUBLICATION-QUADRATIC EQUATIONS -MULTIPLE CHOICE QUESTIONS (LEVEL-II)
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  14. The number of real solutions of ((9)/(10))^(x) = - 3 + x - x^(2) is :

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  15. If a + b + c = 0 , then the equation equation : 3ax^(2) + 2bx + c = ...

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  16. If alpha, beta are the roots of ax^(2) - 26x + c = 0, then alpha^(3...

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  20. The least integer satisfying : 49.4 - ((27 - x)/(10)) lt 47.4 - ((2...

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