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Solve 2011 CBSE : Mathematics Set III question paper
1. The roots of the quadratic question x2+5x-(α+1) (α+6)= 0, where α is a constant are
(A) α+1, α+6
(B) (α+1), -(α+6)
(C) -(α+1), (α+6)
(D) -(α+1), -(α+6)
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2.The value of a30-a20- for the A.P 2, 7, 12, 17,..... is
(A) 100
(B) 10
(C) 50
(D) 20
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5. If the area of a circle is numerically equal to twice its circumference, then the diameter of the circle is
(A) 4 units
(B) π units
(C) 8 units
(D) 2 units
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