Question 105

Find the unit digit in the product $$(4387)^{245} \times (621)^{72}$$.

Solution

we need to find unit digit of $$(4387)^{245} \times (621)^{72}$$

unit digit of $${4387^{245}}$$ = unit digit of $${7^1}$$ = 7

unit digit of $${621^{72}}$$ = 1

and hence 7 x 1 = 7 is the unit digit for the given expression

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