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Question

The first three digits of the square of 185 are:

A
335
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B
342
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C
368
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D
377
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Solution

The correct option is B 342
Using the shortcut to find the square of a number whose units digit is 5, the square of 185 is:
1852=(18)(18+1)(100)+25
=34200+25
=34225
Thus, the first three digits are 342.

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