What is the ones digit of $$\(9^{9}+9^{10}+9^{11}+9^{12}+9^{13}+9^{14}+9^{15}+9^{16}+9^{17}\)$$ ?
A.
9
B.
7
C.
1
D.
49
Exam No：2021 First Round Grade 7 Year：2021 Question No：19
Answer:
A
Knowledge points:
G7 - Number Theory - Cyclicity (Unit Digits)
Solution:
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