Comments Off on India UPSC Exam Fill Odd Numbers in Boxes
A plausible explanation Here’s a way: (11-7+9-13) + (1x3x5) + (15) = 30, where each number is used only “once”. One clue is to note that you may “repeat” the numbers meaning you most likely need to put more than “1 number” in each box. Also, the elementary number theory fact that (odd) +...
Comments Off on Malaysian Junior IMO Selection Test 2017
Malaysian IMO Selection Test 2017 (held on 6 November 2016, Junior category) *Included, my solution attempts too during a Math Olympiad Camp at Taiping, Perak between (27 – 30) December 2016. 
Question 576 digits are used to record the number of cars at a car park. How many cars are there altogether? Solution It means as you record the number of cars using 1, 2, 3,.. 10, 11,… 100, 101 etc., a total of 576 digits are used to write all those counting numbers...
Question I have some 5 cents, 10 cents and 50 cents coins. Without looking I take three coins and put on the table. How much could I possibly put on the table? Solution If it’s asking the possible sums which can be made from the 3 coins, then it could be as follows:...
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