Practice Japan questions with answers and explanations.
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Use combinations: C(12,3) = 220.
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Probability = favourable outcomes ÷ total outcomes.
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Probability = favourable outcomes ÷ total outcomes.
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Mean = (3 + 20 + 7 + 23)/4 = 13.25.
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f(7)=2×7+3=17.
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10% of 38 = 3.8.
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Area = 15 × 21 = 315 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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f(7)=6×7+4=46.
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10% of 30 = 3.
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Area = 8 × 19 = 152 cm².
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By Vieta’s formula, the sum of the roots is the coefficient of x with sign changed.
