Question:Unit digit in `7^4` is 1`
Answer So,unit digit in `7^92` is 1. :.Unit digit in `7^95` is 3. [:. Unit digit in `1 xx 7 xx 7 xx `is 3 ] Unit digit in `3^4`is 1 :. Unit digit in `3^56` is 1. :. Unit digit in `3^58` is 9. [:.Unit digit in `1 xx 3 xx 3 xx` is 9] :. Unit digit in `(7^95 - 3^58)` is 4.[Subtracting unit digit 9 from unit digit]
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Unit digit in `7^4` is 1`