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5. What is the last digit of 72015?(B) 3,(C) 7,(D) 9. |
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Answer» Let us take a look at the last digit of the first powers of 7. 7^1=771=7-> 7 7^2=49-> 9 7^3=343-> 3 7^4=2401-> 1 7^5=16807-> 7so unit digit will be 7 as 7^5 unit digit is 7 so 7^15 is the multiple of 5 hence it will have same value |
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