Question:Unit digit in `7^4`is 1.` 

Answer :.Unit digit in `7^68`is 1.

 :.Unit digit in `7^71`is 3. `[1 xx 7 xx 7 xx 7` gives unit digit 3]

 Again,every power of 6 will give unit digit 6.

 :. Unit digit in `6^59` is 6.

 Clearly,unit digit in `3^4` is 1.

 So,unit digit in `3^64` is 1

 :.Unit digit in `3^65` is 3.

 :. Unit digit in `(7^71 xx 6^59 xx 3^65)` is 4. `[3 xx 6 xx 3`gives unit digit 4]` 

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