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If a, b, c are the orders of the differe...

If a, b, c are the orders of the differential equations
`(d^(2)y)/(dx^(2)) - (5dy)/(dx) + 6y = 0, ((dy)/(dx))^(3) + ((dy)/(dx))^(2) + y^(4) = 0, (d^(3)y)/(dx^(3)) + 2 ((dy)/(dx))^(4) + (dy)/(dx) = cos x`
then the ascending order of a, b, c is

A

a, b ,c

B

b, c,a

C

c, a,b

D

b, a, c

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The correct Answer is:
D
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