exam Maths Puzzle Numerical Ability

Each question of a 5-question multiple choice exam has 3 possible answers. Suppose a student picks an answer at random for each question. Find the probability the student selects the correct answer on none of the questions.

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exam Other Question

If you are given a right triangle with an acute angle ((((theta))), what two trigonometric functions of (((theta))) can you calculate using the lengths of the hypotenuse and the side opposite (((theta)))? please help.

ln x - ln(x-5)=ln 12

Round to three significant digits.