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Solve 1f=1s1+1s2\frac { 1 } { f } = \frac { 1 } { s _ { 1 } } + \frac { 1 } { s _ { 2 } }

Question 267

Multiple Choice

Solve: 1f=1s1+1s2\frac { 1 } { f } = \frac { 1 } { s _ { 1 } } + \frac { 1 } { s _ { 2 } } for ff


A) f=s1s2s1+s2f = \frac { s _ { 1 } s _ { 2 } } { s _ { 1 } + s _ { 2 } }
B) f=+1f = + 1
C) f=s1+s2f = s _ { 1 } + s _ { 2 }
D) f=s1s2s1s2f = \frac { s _ { 1 } s _ { 2 } } { s _ { 1 } - s _ { 2 } }

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