How many years passed between the design of the Petzval lens in 1840 and the patent of the BaniÄ parachute in 1914?
Answer and explanation
Correct answer: B. 74 years
- Step 1: Subtract the years: 1914 minus 1840. Step 2. . Answer: 74 years. Why not the others: The other values are subtraction slips.
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