1.

If `(1)/(a)+(1)/(b)=(1)/(c)+(1)/(d)`, express a in terms of b,c and d.A. `a=(bcd)/(bc+cd-bd)`B. `a=(bcd)/(cd+bd-bc)`C. `a=(bcd)/(bd+bc+cd)`D. `a=(bcd)/(bd+bc-cd)`

Answer» Correct Answer - D
`(1)/(a)+(1)/(b)=(1)/(c)+(1)/(d)`
`implies(1)/(a)+(1)/(c)+(1)/(d)-(1)/(b)`
`implies(1)/(a)=(bd+bc-cd)/(bcd)`
`thereforea=(bcd)/(bd+bc-cd)`


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