InterviewSolution
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InterviewSolution
| 1. |
What is the unit digit in(7 - 3)? |
| Answer» Unit digit in 795 = Unit digit in [(74)23 x 73] = Unit digit in [(Unit digit in(2401))23 x (343)] = Unit digit in (123 x 343) = Unit digit in (343) = 3 Unit digit in 358 = Unit digit in [(34)14 x 32] = Unit digit in [Unit digit in (81)14 x 32] = Unit digit in [(1)14 x 32] = Unit digit in (1 x 9) = Unit digit in (9) = 9 Unit digit in (795 - 358) = Unit digit in (343 - 9) = Unit digit in (334) = 4. So, Option B is the answer. | |