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Maths Puzzle
x and 2x are three digit positive integers such that both x and 2x has only even digits. (For ex x = 200 and 2x = 400). How many values x can take ??
a) 64
b) 18
c) 16
d) 125
e) 100
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Others Other Question
Sum of five consecutive terms of an increasing geometric progression is 211. It is known that all the five terms are positive integers. Find the number of perfect squares among these five terms.
A. 2 B. 3 C. 4 D. 5
In how many ways can 5 students and 5 teachers sit around a circular table such that no two teachers sit together?