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If a, b, c are in H.P and ab + bc + ca = 15, then ca=

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5

b

7

c

9

d

10

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detailed solution

Correct option is A

b=2aca+cab+bc=2ac2ac+ac=15,3ac=15, ac=5

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Given that $α, γ$ are roots of the equation $A x^{2} - 4 x + 1 = 0,$ and $β, δ$ the roots of the equation of $B x^{2} - 6 x + 1 = 0,$ such that $α, β, γ,$ and $δ$ are in H.P., then

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