allery7^25 ৰ একক সংখ্যা কিমান?
A1
B3
C7
D9
Answer & Solution
Correct answer: C. 7
7^n চক্ৰৰ একক সংখ্যা: 7, 9, 3, 1, 7, 9, 3, 1... (কাল
4)।
25 mod 4 = 1, গতিকে একক সংখ্যা 7^1 = 7 মিলে।
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