23. Binet's Formula The following formula is known as Binet's formula for the nth Fibonacci number. 1 + V5 - F, 2 The advantage of this formula over the recursive formula F, = F,-1 + F-2 is that you can determine the nth Fibonacci number without finding the two pre- ceding Fibonacci numbers. Use Binet's formula and a calculator to find the 20th, 30th, and 40th Fibonacci numbers.

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