A) 0
B) 4
C) 6
D) 7
Correct Answer: B
Solution :
[b] \[Unit\text{ }digit\text{ }in\text{ }{{7}^{4}}\text{ }is\text{ }1.\text{ }So,\text{ }unit\text{ }digit\text{ }in\text{ }{{7}^{92}}\text{ }is\text{ }1.\] \[\therefore \,\,\,Unit\text{ }digit\text{ }in\text{ }{{7}^{95}}\text{ }is\text{ }3.\] \[Unit\text{ }digit\text{ }in\text{ }{{3}^{4}}\text{ }is\text{ }1.\] \[\therefore \,\,\,Unit\text{ }digit\text{ }in\text{ }{{3}^{56}}\text{ }is\text{ }1.\] \[\therefore \,\,\,Unit\text{ }digit\text{ }in\text{ }{{3}^{58}}\text{ }is\text{ }9.\] \[\therefore \,\,\,Unit\,\,\,digit\,\,\,in\left( {{7}^{95}}-\,{{3}^{58}} \right)=\left( 13-\,9 \right)=4.\]
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