Solve 2012 CBSE-Mathematics Question Paper (Set-2) given here.
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5. If a line has direction ratios 2, —1, —2, then what are its direction cosines?
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9. Let * be a (binary) operation an N given by a * b = LCM (a,b) for all a,b € N. Find 5*7.
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12. How many times must a man toss a fair coin, so that the probability of having at least one head is more than 80%?
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23. Find the equation of the plane determined by the points A(3, —1, 2), R(5, 2, 4) and C(-1, -1, 6) and hence find the distance between the plane and the point P(6, 5, 9).
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