(3547) pow 153 * (251) pow 72
(7 pow 4) pow 38 * 7 * 1
Now 7 pow 4 gives us unit digit of 1
Hence 1*7*1=7
Hint : Try to find the power of last digit where we get 1 as remainder (7 pow 4) in this case and then break up to nearest divisor 153 divided by 4 i.e. 38.
Now we have 1 as remainder so we will need to multiply remainder times and we get our unit digit.
(7 pow 4) pow 38 * 7 * 1
Now 7 pow 4 gives us unit digit of 1
Hence 1*7*1=7
Hint : Try to find the power of last digit where we get 1 as remainder (7 pow 4) in this case and then break up to nearest divisor 153 divided by 4 i.e. 38.
Now we have 1 as remainder so we will need to multiply remainder times and we get our unit digit.
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