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July 2nd, 2015, 01:40 PM   #21
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Math Focus: Wibbly wobbly timey-wimey stuff.
C'mon people! It's a trick question. It is intuitively obvious that f(3)= 87653 (note the pattern of 87653.) Clearly we can immediately say:
$\displaystyle f(x) = \frac{87647}{120} x^4 - \frac{1139411}{60} x^3 + \frac{21999517}{120} x^2 - \frac{46715911}{60} x + 1227058$

Thus f(3) = 87653.

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July 2nd, 2015, 09:11 PM   #22
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Math Focus: Calculus
The answer is 6, 3*2=6.
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July 3rd, 2015, 05:34 AM   #23
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Do you care, Denis?
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July 3rd, 2015, 05:52 AM   #24
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Originally Posted by Country Boy View Post
Do you care, Denis?
Deeply...losing sleep over this...
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July 12th, 2015, 10:13 AM   #25
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Ans is 6 for sure...
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July 12th, 2015, 11:02 AM   #26
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January 4th, 2016, 11:17 PM   #27
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It turns out that the '?' can be whatever we want it to be!

Allow me to illustrate. Take for example, f(x)=(1/40)x^4-(13/20)x^3+(291/40)x^2-(553/20)x+42, and evaluate f(8.), f(7), f(6), f(5), f(3). It turns out that:


Wait, what sorcery is this? Turns out that although the popular rule f(x)=x(x-1), which gives f(x)=6, satisfies the known values in the sequence, that f(x)=(1/40)x^4-(13/20)x^3+(291/40)x^2-(553/20)x+42 also satisfies them--except with a different value of f(3)!

Here's another one that also works but gives f(3)=12:

And here is one where f(3)=π

Finally, in general if you want the '?'=k, i.e., f(3)=k where k is the value of your choice, then

More details here:

. . . I know what you're thinking, "But you just generated the pattern using a fourth degree polynomial--anybody can do that!" Hence, I present to you a non-polynomial alternative . . .

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January 5th, 2016, 04:14 AM   #28
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Yes, given a finite number of data points there exist an infinite number of functions giving those values.
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January 6th, 2016, 06:20 PM   #29
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Math Focus: Algebra
This is the basic question in Maths. The simplest way of answer it is already posted.

Just look out the question,


If you see that the answer comes from the descending multiplication way.

8=56 (8*7=56)
7=42 (7*6=42)
6=30 (6*5=30)
5=20 (5*4=20)
4=12 ( 4 is missing here, just put 4)
3=? the answer 6 because 3*2=6

If you want to learn more tricky questions. Connect with a tutor who helps you to solve these questions and help in your exams and as well as in homework.

Last edited by greg1313; January 6th, 2016 at 06:22 PM.
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January 28th, 2016, 03:06 AM   #30
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if 8*7then 56
3*2 will be 6
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