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by ratindasgupta » Mon Oct 08, 2007 4:31 am
the 28th exponent of 7 will have the units digit as 1.
The 23rd exponent of 3 will have units digit as 7.

Therefore (1-7) = 4

Answer is C
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by ldoolitt » Mon Oct 08, 2007 7:35 am
Agree with above. 7 has a cyclicity of 4 and so does 3.
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