If a=(a-1)(a-2)(a-3)then x+y+z=
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If a ! = a ( a − 1 ) ( a − 2 ) ( a − 3 ) . . .1 , then find X + Y + Z , given that X Y Z is a three digit number such that X Y Z = X ! + Y ! + Z !
X = 1
Y = 4
Z = 5
_______________
145 = XYZ
= X! + Y! + Z!
= 1! + 4! + 5!
= 1 + 24 + 120
= 145
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so so sorry I trying to solve it very seriously but I don't get the and right
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