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Kara Macias
Mathematics
2 January, 21:16
Which number is a prime number?
141
161
171
151
+2
Answers (
1
)
Jamie Rosario
2 January, 21:38
0
141 (The original number); 1 + 4 + 1 = 6 (Add each individual digit together); 6 is divisible by 3; Then 141 is divisible by 3; 141 isn't a prime number; In the same way, 171 is divisible by 9; then, 171 isn't a prime number;
161 = 7 x 23; 161 is divisible by 7; then, 161 isn't a prime number;
Test whether 171 is divisible by 2, 3, 5, 7, 11, 13 (an algorithm that tests each incremental m against all known primes < division);
but, 171 isn't divisibile by 2,3,5,7,11,13;
Finally, 171 is a prime number;
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