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