CUET · MATHS · PYQ PAPER 2025
The least non-negative remainder, when \(5^{61}\) is divided by 7 , is
- A 6
- B 4
- C 5
- D 2
Answer & Solution
Correct Answer
(C) 5
Step-by-step Solution
Detailed explanation
\(5^6 \equiv 1 \pmod{7}\) \(5^{61} = 5^{6 \times 10 + 1} = (5^6)^{10} \cdot 5^1 \pmod{7}\) \(5^{61} \equiv (1)^{10} \cdot 5 \pmod{7}\) \(5^{61} \equiv 5 \pmod{7}\)
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