Practice Japan questions with answers and explanations.
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The conjugate changes the sign of the imaginary part.
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z=(x−mean)/sd=2.
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Repeated multiplication gives 31381059609.
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log x + log y = log(xy).
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The sum is 3(1+…+5)=3×15=45.
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The sum is 3(1+…+5)=3×15=45.
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Use combinations: C(10,4) = 210.
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Probability = favourable outcomes ÷ total outcomes.
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10% of 46 = 4.6.
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Area = 6 × 14 = 84 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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Mean = (4 + 11 + 1 + 15)/4 = 7.75.
