Practice Japan questions with answers and explanations.
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Area = 3 × 3 = 9 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(9,4) = 126.
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Probability = favourable outcomes ÷ total outcomes.
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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(8,2) = 28.
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Probability = favourable outcomes ÷ total outcomes.
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10% of 30 = 3.
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Area = 6 × 18 = 108 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(7,3) = 35.
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Probability = favourable outcomes ÷ total outcomes.
