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cramya wrote:The positive integer k has exactly 2 positive prime factors 3 and 7. If k has a total of 6 positive factors inlcuding 1 and k what is the value of k?
1) 3 ^ 2 is a factor of k
2) 7 ^ 2 is not a factor of k
FROM STEM
K = 3^A*7^B
FROM 1
INSUFF
A = 2 OR 3 OR ...
FROM 2
B = 1
BOTH
iNSUFF
E
)how did u get no. of factors = (2+1)*(1+1) = 6 ??Case I
3^2 * 7 , no. of factors = (2+1)*(1+1) = 6
Case II
3* 7^2, no. of factors = (1+1) * (2+1) = 6
Here is an example of how you can find no. of factors for any number.uttara wrote:Hi parallel_chase
can u explain these lines
how did u get no. of factors = (2+1)*(1+1) = 6 ??Case I
3^2 * 7 , no. of factors = (2+1)*(1+1) = 6
Case II
3* 7^2, no. of factors = (1+1) * (2+1) = 6
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