A) 6
B) 7
C) 8
D) 9
Correct Answer: B
Solution :
Clearly, unit's digit in the given product = unit's digit in \[{{7}^{153}}\times {{1}^{72}}\] Now, \[{{7}^{4}}\]gives unit digit 1. \[\therefore \] \[{{7}^{153}}\] gives unit digit \[=(7\times 1)=7.\] Also \[{{1}^{72}}\]gives unit digit 1. Hence, unit's digit in the product \[=(7\times 1)=7\].
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