allery7^25 ର ଏକକ ସଂଖ୍ୟା କ’ଣ?
A1
B3
C7
D9
Answer & Solution
Correct answer: C. 7
7^n ର ଏକକ ଅଙ୍କ ଏହି ଚକ୍ରରେ ଆସେ: 7, 9, 3, 1, 7, 9, 3, 1... (ପର୍ଯ୍ୟାୟ 4)।
25 mod 4 = 1, ତେଣୁ ଏକକ ଅଙ୍କ 7^1 = 7 ସହ ମେଳେ।
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