Practice Japan questions with answers and explanations.
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Area = 6 × 14 = 84 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(10,4) = 210.
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Probability = favourable outcomes ÷ total outcomes.
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Mean = (11 + 13 + 2 + 24)/4 = 12.50.
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f(7)=2×7+6=20.
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10% of 46 = 4.6.
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Use combinations: C(8,3) = 56.
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Probability = favourable outcomes ÷ total outcomes.
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Mean = (4 + 11 + 1 + 15)/4 = 7.75.
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f(7)=6×7+7=49.
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10% of 38 = 3.8.
