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 Consider Euclid GCD for consecutive Fibonacci numbers (Fib(m),Fib(m - 1))

Computer Science

 Consider Euclid GCD for consecutive Fibonacci numbers (Fib(m),Fib(m - 1)). a) [6pts] Compute the number of iterations T performed in terms of m.

b) [12pts] Using Mathematical Induction (strong form) prove that 1.5m < Fib(m) < 2m for all m ≥ 11.

c) [7pts] Now let n be the input size, i.e., the number of binary digits of Fib(m). From PSN exercise we know that n ≈ log2Fib(m). For convenience, you may take n = log2Fib(m). Obtain bounds for the number of iterations T performed in terms of the input size n.

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Answer:

a) the binary of 0*128 is

1* 162 + 2 * 161+ 8 * 160

=256+32+8

=296

b)the binary of 0*127 is

1* 162 + 2* 161 + 7* 160

=512+32+7

=551

c) the binary of 0 * 680 is

6 * 162 +8 *161 +0* 160

=1536 + 128 + 0

=1664

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