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06 Apr 2018, 04:38
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E
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67% (01:35) correct
33%
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Which of the following numbers is prime?
A. 117
B. 133
C. 189
D. 209
E. 223
A. 117
B. 133
C. 189
D. 209
E. 223
09 Apr 2018, 09:23
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117 is divisible by 3, as 1+1+7 = 9
133 is divisible by 7, as 140-7 = 133
189 is divisible by 3, as 1+8+9 = 18
209 is divisible by 11, as 220-11 = 209
So therefore I think that 223 is prime (E)
133 is divisible by 7, as 140-7 = 133
189 is divisible by 3, as 1+8+9 = 18
209 is divisible by 11, as 220-11 = 209
So therefore I think that 223 is prime (E)
General Discussion
06 Apr 2018, 04:39
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Bunuel
Which of the following numbers is prime?
A. 117
B. 133
C. 189
D. 209
E. 223
A. 117
B. 133
C. 189
D. 209
E. 223
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