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CAT 1999 | Question: 70
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If $n^2= 12345678987654321$, what is n?
12344321
1235789
111111111
11111111
cat1999
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$11^{2} $ =121
$111^{2}$ =12321
$1111^{2}$ = 1234321
Similarly
$(111111111)^{2}$ =12345678987654321.
Hence,option (C)111111111 .
.
Leen Sharma
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