A) 9
B) 7
C) 1
D) 3
Correct Answer: B
Solution :
Since \[{{7}^{1}}=7,\,\,{{7}^{2}}=49,\,\,{{7}^{3}}=343,\,\,{{7}^{4}}=2401\] Similarly, the next higher power of 7 comes out the same digits in the units place respectively. \[\therefore \] digit at units place in \[{{7}^{289}}=\] digit at units place in \[{{\left( {{7}^{4}} \right)}^{72}}.7\] = digit at units place in 1. 7 The units place digit in \[{{7}^{289}}\] is 7.You need to login to perform this action.
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