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**What is the last digit of123456789 X 987654321**

Last digit of multiplication depends on the last digits of two multiple , Here

123456789 have last digit is 9 and 987654321 and that have last digit 1 ,

So,

1 $\times $ 9 = 9

So ,

123456789 $\times $ 987654321 , gives last digit 9

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