If 1/a,1/b,1/c are in A.P.,the(1/a+1/b-1/c)(1/b+1/c-1/a)is equal to

1.	If 1/a,1/b,1/c are in A.P.,the(1/a+1/b-1/c)(1/b+1/c-1/a)is equal to
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