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19 Dec 2003, 15:14
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N
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
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For all n>0,7^6n-6^6n is divisible by....??
a)13
b)127
c)559
d)none
a)13
b)127
c)559
d)none
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19 Dec 2003, 17:11
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I believe A is the answer
Let's take 6n=2 or in other words, n=1/3
The difference between 7^2 and 6^2 = 49-36 = 13
Therefore, as we increase n, the difference between the 2 terms will increase by a base of 13 exponent any number. Thus, the answer is that the solution is divisible by 13
Let's take 6n=2 or in other words, n=1/3
The difference between 7^2 and 6^2 = 49-36 = 13
Therefore, as we increase n, the difference between the 2 terms will increase by a base of 13 exponent any number. Thus, the answer is that the solution is divisible by 13
19 Dec 2003, 19:14
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shubhangi
For all n>0,7^6n-6^6n is divisible by....??
a)13
b)127
c)559
d)none
a)13
b)127
c)559
d)none
factor 13 = 13*1
numerator does not have a 13 at all...out it goes
factor 127=> i think its prime. again..no luck
factor 559 => again prime
i think its just D
