If a(1)=-1 and a(n)=(a(n-1))/(n+2) then ...

If `a_(1)=-1 and a_(n)=(a_(n-1))/(n+2)` then the value of `a_(4)` is ____.

`(-1)/(20)`

`(-1)/(4)`

`(1)/(840)`

`(-1)/(120)`

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