allery7^25 এর একক সংখ্যা কত?
A1
B3
C7
D9
Answer & Solution
Correct answer: C. 7
7^n চক্রের একক সংখ্যা: 7, 9, 3, 1, 7, 9, 3, 1... (পিরিয়ড 4)।
25 মোড 4 = 1, তাই ইউনিট ডিজিট 7^1 = 7 এর সাথে মেলে।
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