73^7×57^9 what is the unit digit?
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8 is the unit digit
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3^7 gives the unit digit of 73^7 as 7 and
5^7 gives the unit digit of 57^9 as 3
so 73^7×57^9 gives unit digit as 3×7 =21
and thus unit digit is 1
5^7 gives the unit digit of 57^9 as 3
so 73^7×57^9 gives unit digit as 3×7 =21
and thus unit digit is 1
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