The H.C.F and L.C.M of two numbers a and b are respectively 3 and 105. If a - b = 30, then (1/a) - (1/b) = ?

The H.C.F and L.C.M of two numbers a and b are respectively 3 and 105.

1.	The H.C.F and L.C.M of two numbers a and b are respectively 3 and 105. If a - b = 30, then (1/a) - (1/b) = ?
A.	-2/21
B.	-3/17
C.	-2/13
D.	-3/23
Answer» B. -3/17

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The H.C.F and L.C.M of two numbers a and b are respectively 3 and 105. If a - b = 30, then (1/a) - (1/b) = ?

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