Concept explainers
For Exercises 43-44, use the Fibonacci sequence
. Recall that the Fibonacci sequence can be defined recursively as
for
Prove that
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- What is the 11thterm of the geometric sequence 1.5,3,6,12,... ?arrow_forwardThe Fibonacci sequence fn=1,1,2,3,5,8,13,21,... is defined recursively by f1=1,f2=1,fn+2=fn+1+fn for n=1,2,3,... a. Prove f1+f2+...+fn=fn+21 for all positive integers n. b. Use complete induction to prove that fn2n for all positive integers n. c. Use complete induction to prove that fn is given by the explicit formula fn=(1+5)n(15)n2n5 (This equation is known as Binet's formula, named after the 19th-century French mathematician Jacques Binet.)arrow_forward
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