2023 IOQM/Problem 2
Contents
[hide]Problem
Find the number of elements in the set
Solution1(Quick)
Finding the no. of elements in the set means finding no. of ordered pairs of (, )
Then, .
. Upon simplifying, we get
So, equals to 2 or 3
For = 2, it implies that . So, , Hence all such pairs are of the form (,)
Where each number lies between 2 and 2023 (inclusive). All such pairs are (2, 4);(3, 9);(4, 16);........(44, 1936)
Total no. of these pairs = 43
For = 3, Following a similar pattern, we get the pairs as {2,8}...{12,1728} (,)
Total no. of these pairs = 11
Thus, there are 43+11= elements in the set
~ SANSGANKRSNGUPTA AND ~Andy666
Video Solutions
Video solution by cheetna: https://www.youtube.com/watch?v=z0NPa0tUzZk
Video solution by Unacademy Olympiad Corner: https://www.youtube.com/watch?v=Mm6mXjwU9bY
Video solution by Vedantu Olympiad School: https://www.youtube.com/watch?v=4DJXtR4VHEA
Video solution by Olympiad Wallah: https://www.youtube.com/watch?v=4HSjmY7d3nA
Video solution by : Motion Olympiad Foundation Class 5th - 10th: https://www.youtube.com/watch?v=oVaeHceHXsQ
Please note that above videos solutions are in Hindi, some in English and some in mixed(Hindi + English).
~SANSGANKRSNGUPTA
See Also
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