K is a set of number such that
(i) if x is in K, then -x is in K and
(ii) if each of x and y is in K, then xy is in K
Is 12 in K?
(1) 2 is in K
(2) 3 is in k
I got the right answer, but im unsure of whether I the way I got it is right. Please explain this one.
primes and divisibility 1
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- selango
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stmt1,
2 is in k.So -2 is in k.
-4 also is in k.
We don't abt other values.
Insuff
3 is in k.So -3 is in k.
-9 also is in k
We don't abt other values.
Insuff
Combining 1 and 2,
-3 and -4 are in k.So 12 is in k
Suff
Pick C
2 is in k.So -2 is in k.
-4 also is in k.
We don't abt other values.
Insuff
3 is in k.So -3 is in k.
-9 also is in k
We don't abt other values.
Insuff
Combining 1 and 2,
-3 and -4 are in k.So 12 is in k
Suff
Pick C
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- Gurpinder
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ahh....i get it thxselango wrote:stmt1,
2 is in k.So -2 is in k.
-4 also is in k.
We don't abt other values.
Insuff
3 is in k.So -3 is in k.
-9 also is in k
We don't abt other values.
Insuff
Combining 1 and 2,
-3 and -4 are in k.So 12 is in k
Suff
Pick C
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- Alfred A. Montapert, Philosopher.