Practice Japan questions with answers and explanations.
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Use combinations: C(10,2) = 45.
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Use combinations: C(8,4) = 70.
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Probability = favourable outcomes ÷ total outcomes.
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Mean = (6 + 16 + 5 + 22)/4 = 12.25.
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f(7)=4×7+5=33.
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10% of 42 = 4.2.
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Area = 18 × 17 = 306 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(9,3) = 84.
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Probability = favourable outcomes ÷ total outcomes.
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Mean = (13 + 18 + 6 + 31)/4 = 17.
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By Vieta’s formula, the sum of the roots is the coefficient of x with sign changed.
