Practice Japan questions with answers and explanations.
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By Vieta’s formula, the sum of the roots is the coefficient of x with sign changed.
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Use combinations: C(12,2) = 66.
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Probability = favourable outcomes ÷ total outcomes.
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Mean = (4 + 15 + 6 + 19)/4 = 11.
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f(7)=2×7+6=20.
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10% of 42 = 4.2.
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Area = 16 × 16 = 256 cm².
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Area = 2 × 12 = 24 cm².
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By Vieta’s formula, the sum of the roots is the coefficient of x with sign changed.
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Use combinations: C(11,3) = 165.
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Probability = favourable outcomes ÷ total outcomes.
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Mean = (14 + 13 + 5 + 27)/4 = 14.75.
