State PCS PYQPrelims 2022

BPSC – Combined Competitive Examination · প্রশ্ন 85

Which two natural numbers have a product of 2400 and the sum of their squares equal to 5200?

  1. 80, 30
  2. 75, 32
  3. 60, 40
  4. 120, 20
  5. None of the above / More than one of the above
উত্তর দেখান ও ব্যাখ্যা

উত্তর: (C) 60, 40

ব্যাখ্যা

(x + y)² = 5200 + 4800 = 10000 → 100; (x − y)² = 400 → 20; so 60 and 40.

  • (A) ভুল

    Wrong: 80² + 30² = 7300.

  • (B) ভুল

    Wrong: 75² + 32² ≠ 5200.

  • (C) সঠিক

    Correct: 60 × 40 = 2400 and 3600 + 1600 = 5200.

  • (D) ভুল

    Wrong: 120² + 20² = 14800.

  • (E) ভুল

    Wrong: only one of the options A–D is correct.