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boksana
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ok sorry...... it is 2. The same way.

can somebody post the right solution please.
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The answer is 2.

The hundreds digit will never affect the 10s digit, so I simply ignored it.

31*31 = ?61 (10s and 1s digits of 231^2)
61*61 = ?21 (10s and 1s digits of (231^2)^2)


Where ? means any digit in this place or higher doesn't matter.
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Yes, the answer is 2!



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