If m and n are respectively the order an...

If m and n are respectively the order and degree of the differential equation of
the family of parabolas with focus at the origin and X-axis as its axis ,
then `mn-m + n=`

A

(a) `1`

B

(b) `4`

C

(c) `3`

D

(d) `2`

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The correct Answer is:

C

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