A website Maths Puzzle Category

A group of 630 children is arranged in a row for a group photograph session. Each row contains three fewer children than the row in front of it. What number of rows is not possible?
A. 3
B. 4
C. 5
D. 6
E. 7

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A website Other Question


If x = -0.5, then which of the following has the smallest value?
A. 2^1/x
B. 1/x
C. 1/x^2
D. 2^x
E. 1/√-x

In how many ways can the letters of the word 'LEADER' be arranged?

A. 72 B. 144
C. 360 D. 720
E. None of these