Practice Japan questions with answers and explanations.
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Area = 4 × 13 = 52 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(7,2) = 21.
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Probability = favourable outcomes ÷ total outcomes.
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Mean = (16 + 14 + 4 + 30)/4 = 16.
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f(7)=2×7+6=20.
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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(6,3) = 20.
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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(12,4) = 495.
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Probability = favourable outcomes ÷ total outcomes.
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Mean = (2 + 10 + 2 + 12)/4 = 6.50.
