Practice Japan questions with answers and explanations.
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f(7)=6×7+7=49.
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10% of 38 = 3.8.
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Area = 16 × 12 = 192 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(9,2) = 36.
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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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Area = 9 × 10 = 90 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(8,3) = 56.
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Probability = favourable outcomes ÷ total outcomes.
