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CUET · MATHS · PYQ PAPER 2025

The remainder, when \(5^{60}\) is divided by 7 , is :

  1. A 5
  2. B 1
  3. C 2
  4. D 3
Verified Solution

Answer & Solution

Correct Answer

(B) 1

Step-by-step Solution

Detailed explanation

\(5^3 \equiv 125 \equiv 6 \equiv -1 \pmod{7}\) \(5^{60} \equiv (5^3)^{20} \pmod{7}\) \(5^{60} \equiv (-1)^{20} \pmod{7}\) \(5^{60} \equiv 1 \pmod{7}\)