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| FINDING
UNIT DIGITS OF X^N |
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Ahh…a light bulb goes
off.
We know that 32007 > 22007. Therefore for 32007 we have some digits
X such as
X1X2X3X4X5X6X7X8…Xn7 with a unit digit of 7 and for 22007 we have
some digits Y1Y2Y3Y4Y5Y6Y7Y8…Yn8 with a unit digit of 8.
Now let’s look at the ten’s and unit
digit of 32007 and unit digit of 22007 as shown. |
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