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gamjatang
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When n = 100x + 10y + z, function f is defined as f(n) = 06 Dec 2005, 07:56
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When n = 100x + 10y + z, function f is defined as f(n) = (2^x)(3^y)(5^z).

If f(v) = 9f(u), what is v minus u?

(Answer choices not available)



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laxieqv
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When n = 100x + 10y + z, function f is defined as f(n) = 06 Dec 2005, 08:16
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gamjatang
When n = 100x + 10y + z, function f is defined as f(n) = (2^x)(3^y)(5^z).

If f(v) = 9f(u), what is v minus u?

(Answer choices not available)
Show more


notice 9= 3^2 --> the only possible difference between f(v) and f(t) is of 3^y ....f(v) contains 3^(y+2) ...powers of 2 and 5 in both functions f() are the same

----> u= 100x+10y+z and v= 100x+10(y+2) +z
----> v-u= 10*2= 20
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christoph
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When n = 100x + 10y + z, function f is defined as f(n) = 06 Dec 2005, 08:54
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laxieqv
gamjatang
When n = 100x + 10y + z, function f is defined as f(n) = (2^x)(3^y)(5^z).

If f(v) = 9f(u), what is v minus u?

(Answer choices not available)

notice 9= 3^2 --> the only possible difference between f(v) and f(t) is of 3^y ....f(v) contains 3^(y+2) ...powers of 2 and 5 in both functions f() are the same

----> u= 100x+10y+z and v= 100x+10(y+2) +z
----> v-u= 10*2= 20
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:cool
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gamjatang
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When n = 100x + 10y + z, function f is defined as f(n) = 07 Dec 2005, 08:05
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bewakoof
laxieqv
gamjatang
When n = 100x + 10y + z, function f is defined as f(n) = (2^x)(3^y)(5^z).

If f(v) = 9f(u), what is v minus u?

(Answer choices not available)

notice 9= 3^2 --> the only possible difference between f(v) and f(t) is of 3^y ....f(v) contains 3^(y+2) ...powers of 2 and 5 in both functions f() are the same

----> u= 100x+10y+z and v= 100x+10(y+2) +z
----> v-u= 10*2= 20

u are GENIIUS!
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Yes she is.

The OA is 20.
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stretchad
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When n = 100x + 10y + z, function f is defined as f(n) = 07 Dec 2005, 08:38
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crap, I could never get that.
Would this be considered medium difficulty or hard?
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kfranson
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When n = 100x + 10y + z, function f is defined as f(n) = 08 Dec 2005, 12:04
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Got 20 as well. Only way to increase 9 fold is using 3^2 which means y has increased by 2 and 10*2 = 20.
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gamjatang
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When n = 100x + 10y + z, function f is defined as f(n) = 09 Dec 2005, 10:38
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stretchad
crap, I could never get that.
Would this be considered medium difficulty or hard?
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I'd say, this question falls in the "super hard" category.
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nakib77
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When n = 100x + 10y + z, function f is defined as f(n) = 09 Dec 2005, 11:17
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gamjatang
stretchad
crap, I could never get that.
Would this be considered medium difficulty or hard?

I'd say, this question falls in the "super hard" category.
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Do you get this type of questions in the real test.



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