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Grade: 12
        
Let n=1!+4!+7!.........+400! Then tens digit of n is
one year ago

Answers : (1)

Aditya Gupta
2014 Points
							
unit digit of all factorials after 5 is zero, because p!=5!*6*...*p=120*6*...*p 
now, n is 1+24+10*m.
=25+10*m
so, unit digit is 5.
one year ago
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