$3^{65}$ x $6^{59}$ x $7^{71}$ গুণফলটিতে একক স্থানীয় অঙ্কটি কত?

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What is the unit digit in the product $3^{65}$ x $6^{59}$ x $7^{71}$ ?

A1

B5

C7

D4

Answer:

D. 4

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