If k is a positive integer. Is ka prime number??1) No integers between...
Statement 1:
Property of a prime number: k is a prime number if no integer between 2 and square root of k (inclusive) is a factor of k.
Sufficient
Statement 2:
k/2 >= sqrt(k)
So it satisfies the above-mentioned property.
Sufficient
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If k is a positive integer. Is ka prime number??1) No integers between...
K and ka are divisible by any integer greater than 1.
This statement alone is not sufficient to determine whether ka is a prime number or not. It only tells us that there are no integers between k and ka that are divisible by any integer greater than 1, but it does not rule out the possibility that ka itself is divisible by a prime number.
For example, if k = 2 and a = 3, then there are no integers between 2 and 6 (which is ka) that are divisible by any integer greater than 1. However, 6 is not a prime number since it is divisible by 2 and 3.
2) k is a prime number.
This statement alone is also not sufficient to determine whether ka is a prime number or not. It only tells us that k is a prime number, but it does not provide any information about the divisibility of ka.
For example, if k = 7 and a = 2, then ka = 14, which is not a prime number since it is divisible by 2.
Combining both statements, we still cannot determine whether ka is a prime number or not. The first statement tells us that there are no integers between k and ka that are divisible by any integer greater than 1, but it does not rule out the possibility that ka itself is divisible by a prime number. The second statement tells us that k is a prime number, but it does not provide any information about the divisibility of ka. Therefore, the answer is (E) - both statements together are insufficient to answer the question.
If k is a positive integer. Is ka prime number??1) No integers between...
But 2 is not inclusive, k can be 4 and k can be 3 as per this statement…