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Question

f1=2,f2=3
fn=fn+1fn+2 for n 1, then what is f123?

A
-2
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B
-1
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C
1
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D
2
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Solution

The correct option is C 1
f1=2,f2=3fn+2=fn+1fn, n1f3=f2f1=32=1f4=f3f2=13=2f5=f4f3=21=3f6=f5f4=3+2=1f7=f6f5=1+3=2f8=f7f6=2+1=3f9=f8f7=32=1
The values of fn will be repeated after n = 6
f123 1236 Remainder = 3
f123=f3=1

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