Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ ¹ ² ³ °
 

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Hi;
Tks for your reply. I input a wrong number that Number in 1st group: a=26
Hi;
I input a,b,c,d use odds ratio calculator 