alleryThe remainder when 2^10 is divided by 7 is:
A1
B2
C4
D6
Answer & Solution
Correct answer: B. 2
1. 2^3 = 8 ≡ 1 mod 7. 2. 2^10 = (2^3)^3 · 2 ≡ 1·2 = 2 mod 7.
_Source: 501-GMAT-Questions Section 4 / Manhattan Quant Bank_
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