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I a < (a + b)/2 < b

II b < (b + a)/2 < a

III a < ab < b

A. I only B. II only C. III only D. I and II only E. II and III only

A. -1 B. -a

A. 2ab /(a - b) B. 2ab / (a + b) C. 2 /(a

D. b / 2(a - b) E. b / 2(a + b)

A. 3 B. 4 C. 5 D. 6 E. 15

A. (n - 1)

D. (n - 1)(n - 2) E. 2(n - 1)

A. 100 B. 120 C. 130 D. 150 E. 180

A. 19 B. 23 C. 32 D. 42 E. 47

A. 4 B. 4

A # B = (A - B) 2 , when A and B are real numbers. Each of the following is true except

A. (A @ B)+(A # B)=2(A

C. (A @ B)(A # B)=( A

A. 5 B. 4 C. -4 D. -5 E. -6

From Math Puzzle 11 to Math Teasers

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