Question:Unit digit in the given product=unit digit in `7^153 xx 1^72`.
Answer Now `7^4`gives unit digit 1. :.`7^152` gives unit digit 1. :.`7^152` gives unit digit `(1 xx 7)=7` Also `1^72`gives digit 1. :.Unit digit in the product =`(7 xx 1)=7`.
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Unit digit in the given product=unit digit in `7^153 xx 1^72`.