NextMockதேர்வுகளைத் தேடுங்கள், எ.கா. SSC CGL, UPPSC, Lekhpal
UPSC PYQPrelims 2026

Civil Services Examination · வினா 66

A is a 2-digit number with different digits. B is also a 2-digit number and is obtained by reversing the digits of A. If A - B is a multiple of 27, where A > B, how many such different A's are possible?

  1. 6
  2. 9
  3. 12
  4. 18
விடையைக் காட்டு & விளக்கம்

விடை: (B) 9

விளக்கம்

A - B = 9(a - b), so a - b must be a multiple of 3. With b ≥ 1 (B is 2-digit): a - b = 3 gives 6 numbers (41 to 96), a - b = 6 gives 3 (71, 82, 93). Total 9.