205:1

Could you clarify what you mean by "205:1"? A few possibilities:

• Pure ratio: 205:1
• Probability/odds: “odds of 205 to 1” (in favor or against)
• A problem label: Problem 205:1 from a book

If you want the ratio converted:

• As a decimal: 205 ÷ 1 = 205
• As a percentage of the whole (205 to 1): 205 / (205 + 1) = 205/206 ≈ 99.5146%
• If used as odds in favor: probability = 205/(205+1) ≈ 0.99515 (about 99.515%)
• If used as odds against: probability = 1/(205+1) = 1/206 ≈ 0.00485 (about 0.485%)

If this is a specific exercise (Problem 205:1), please share the exact problem statement or the book name and edition, and I’ll help solve it.