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Yes,its b also.
But my answer has got nothing to do with binomial.
See,3^4=81
3^8=6561
3^12=531441
So,as it is evident that the tens digit goes on decreasing as 8,6,4,2,0 and the the cycle repeats again.And since 3^20 has tens place has 0,3^100 also has.
But,we wont be able to calculate powers of 3 in the exam.There is a better method.
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Moderation Team
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