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How many even 4 digit whole numbers are there?(a) 1358(b) 7250(c) 4500(d) 3600The question was asked in an online quiz.This intriguing question comes from Fundamental Principle of Counting in division Counting of Discrete Mathematics

Answer»

Right option is (C) 4500

To elaborate: The thousands digit cannot be zero, so there are 9 choices. There are 10 possibilities for the hundreds digit and 10 possibilities for the tens digit. The units digit can be 0, 2, 4, 6 or 8, so there are 5 choices. By the basic counting principle, the NUMBER of EVEN five digit WHOLE numbers is 9 × 10 × 10 × 5 = 45,00.



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