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A Statistical Challenge
A Binomial Distribution with Normal Distribution Approximation Question: Let Y be b(n, 0.55). Find the smallest value of…
How many 4-digit numbers are divisible by 3 and have 23 as their last two digits??
Answer Let X be your 4 digit number. X = ‘ab23’ = 1000a + 100b + 2*10 +…
An Oxford Entrance Math Exam Question
I think it’s like this (I could be wrong): Let t = time taken by the “blue”…
In triangle ABC, angle ABC=15 degrees, angle ACB=30 degrees, AD is the median to side BC, A-D-C. angle BAD=?
Answer We will use the Sine Rule. In triangle ABD, AD / sin(ABD) = BD / sin(BAD) So…
A Trigonometric Dilemma in a Triangle
Given a triangle ABC with AB = AC, BC = AD and angle (BAC) = 20. Find angle(ADB)….
Global Math Challenge GMC 2015
Details: (Solutions are ranked based on correct answer & time taken for Global Ranking – this is for…