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Question

If x=5+151, value of x2+x1 is

A
5
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B
2
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C
5
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D
5+1
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Solution

The correct option is D 5+1
x=5+151=5+151×5+15+1=(5+1)251=5+12x2+x1=(5+12)2+5+121=5+1+254+5+121=3+52+5+121=3+5+5+122=5+1

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