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प्रश्न
Find the unit digit of the numeric expression: 1623 + 7148 + 5961
उत्तर
In 1623, the unit digit of base 16 is 6 and the power is 23 ...(odd power)
Therefore, unit digit of 1623 is 6
In 7148, the unit digit of base 71 is 1 and the power is 48 ...(even power)
Therefore, unit digit of 7148 is 1
Also in 5961, the unit digit of base 59 is 9 and the power is 61 ...(odd power)
Therefore, unit digit of 5961 is 9
Sum of the unit digits = 6 + 1 + 9 = 16
∴ Unit digit of the given expression is 6.
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