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Question

If x=1111(20 digits), y=3333(10 digits) and z=2222(10 digits), then xz is equal to

A
y2
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B
2y2
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C
y3
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D
3y3
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Solution

The correct option is A y2
We know that,
x=1111(20 digits)x=9999(20 digits)9x=19(10201)y=13(10101)z=29(10101)

Now,
xz=10209210109+19xz=(1010313)2xz=[13(10101)]2xz=y2

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