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Question

Write the first five terms of each of the following sequences.
F1=F2=1 and Fn=Fn1+Fn2,n=3,4,.....

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Solution

We are given that F1=F2=1 and Fn=Fn1+Fn2
We can observe that a term is the sum of previous two terms.
Since we are given first two terms all other terms can calculated.
F3=F2+F1=1+1=2
F4=F3+F2=2+1=3
F5=F4+F3=3+2=5

Therefore the first five terms of the series are 1,1,2,3,5
This series is called Fibonacci series.

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