1. Find the unit place digit in 71 x 72 x 73 x 74 x 76 x 77 x 78 x 79.
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By: anil on 05 May 2019 02.05 am
Expression : 71 x 72 x 73 x 74 x 76 x 77 x 78 x 79 Unit place is the product of unit digits. = $$(1 imes2 imes3 imes4) imes(6 imes7) imes(8 imes9)$$ = $$24 imes42 imes72$$ $$equiv4 imes2 imes2=16$$ Thus, unit digit = 6 => Ans - (D)
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