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If the expression x^2+2(a+b+c)x+3(b c+ca...

If the expression `x^2+2(a+b+c)x+3(b c+ca+a b)` is a perfect square, then

a.`a=b=c`

b. `a=+-b=+-c`

c. `a=b!=c`

d. none of these

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