1.

a,b,c,d in R^+ such that a,b and c are in H.P and ap.bq, and cr are in G.P then p/r+t/p is equal to

Answer»

ab=cd
ac=bd
bc=ad
NONE of these

SOLUTION :2b=a+C,`c=(2BD)/(b+d)`
`rArr2bd=c(b+d)`
`RARR(a+c)d=c(b+d)` [as 2b=a+c]
`rArrad+cd=bc+cd`
`rArr bc=ad`


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