allery7^25 का इकाई अंक क्या है?
A1
B3
C7
D9
Answer & Solution
Correct answer: C. 7
7^n चक्र के इकाई अंक: 7, 9, 3, 1, 7, 9, 3, 1...
(अवधि 4).
25 mod 4 = 1, इसलिए इकाई अंक 7^1 = 7 से मेल खाता है।
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