The GATE Grind

GATE 2026 MA – Question 27

Ordinary Differential Equations · Series Solutions and Special Functions · 1 mark · Multiple select

For $2x(x-2)^2y^{\prime\prime}+3xy^\prime+(x-2)y=0$, which statements about x = 2 are true?

  1. It is not singular.
  2. It is singular.
  3. It is regular singular.
  4. It is not regular singular.

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Correct answer: (B) It is singular.; (D) It is not regular singular.

Explanation

Divide by the leading coefficient: $p(x)=3/[2(x-2)^2]$, $q(x)=1/[2x(x-2)]$. Coefficients are singular at 2. Regular singularity would require (x−2)p and (x−2)²q analytic there, but $(x-2)p=3/[2(x-2)]$ still has a pole. Thus the point is irregular singular: **B,D**.

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