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what is the value of this expression (1-1/2)*(1-1/3)*(1-1/4)*(1-1/5)*........*(1-1/99)

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(1-1/2)*(1-1/3)*(1-1/4)*(1-1/5)*........*(1-1/99) If 4^a=5 5^b=6 6^c=7 7^d=8 Then find the value of abcd