Question 35Asked in CTET February 2026 Paper 2 Maths & Science, 7 Feb 2026

If 2 Aयदि

If 2 A × A ------ B 2 A where A and B are digits, then
यदि 2 A × A ------ B 2 A है, जहाँ A और B अंक हैं, तो
  1. AA = 6, B = 1A = 6, B = 1
  2. BA = 1, B = 6A = 1, B = 6
  3. CA = 1, B = 5A = 1, B = 5
  4. DA = 5, B = 1A = 5, B = 1
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Correct answer: (D) A = 5, B = 1A = 5, B = 1

Explanation

A × A must end in A, so A is 1, 5 or 6. 21 × 1 = 21 and 26 × 6 = 156 do not give the form B2A, but 25 × 5 = 125 does, so A = 5 and B = 1.A × A का अंतिम अंक A होना चाहिए, इसलिए A = 1, 5 या 6 है। 21 × 1 = 21 और 26 × 6 = 156 से B2A रूप नहीं बनता, पर 25 × 5 = 125 बनता है, इसलिए A = 5 और B = 1।

From CTET February 2026 Paper 2 Maths & Science, 7 Feb 2026 — Previous Year Paper

This is question 35 of CTET February 2026 Paper 2 Maths & Science, 7 Feb 2026 — Previous Year Paper. See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.