alleryWhat is the units digit of 7^25?
A1
B7
C3
D9
Answer & Solution
Correct answer: B. 7
1. Powers of 7 cycle 7, 9, 3, 1 every 4. 2. 25 mod 4 = 1. 3. Units digit = 7.
_Source: 501-GMAT-Questions Section 4 / Manhattan Quant Bank_
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