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2007 Cyprus MO/Lyceum/Problem 4

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Problem

We define the operation a*b = \frac{1+a}{1+b^2}, \forall a,b \in \real.

The value of (2*0)*1 is

\mathrm{(A) \ } 2\qquad \mathrm{(B) \ } 1\qquad \mathrm{(C) \ } 0\qquad \mathrm{(D) \ } \frac{1}{2}\qquad \mathrm{(E) \ } \fr...

Solution

\frac{1+\frac{1+2}{1+0^2}}{1+1^2}=\frac{1+3}{2}=2\Longrightarrow\mathrm{ A}

See also

2007 Cyprus MO, Lyceum (Problems)
Preceded by
Problem 3 		Followed by
Problem 5
1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 • 26 • 27 • 28 • 29 • 30
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