Shoutbox

right, this was the first question on my maths exam today.....i even wrote it on my hand to try it later but i still dont get it...

well heres the question:

A - what are the next to numbers in this sequence:
3, 12, 27, 48, 75, __, __.

B - show the nth number in terms of n



-so gonna get made to look absolutely stupid but i wondered if anyone here would get an answer

3, 12, 27, 48, 75, 108, 147

The next two numbers would be 108 and 147

not sure about calculating the nth term tho, ill have it in a sec

quote:

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Originally posted by A. Madsen
3, 12, 27, 48, 75, 108, 147

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ok, how the hell you get that plus thats only part A

quote:

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Originally posted by may73alliance

quote:

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Originally posted by A. Madsen
3, 12, 27, 48, 75, 108, 147

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ok, how the hell you get that plus thats only part A

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The difference between 2 numbers is incresing with 6 every number.
The difference between 3 and 12 is 9
The difference between 12 and 27 is 15

The difference between 9 and 15 is 6

if you look at the difference between them

12 - 3  = 9

        15 - 9 = 6

27 - 12 = 15

        21 - 15 = 6

48 - 27 = 21

        27 - 21 = 6

75 - 48 = 27


I can't rememebr the way to calculate the nth term, its been 3 years since i was doing this kinda stuff at school

quote:

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Originally posted by A. Madsen

quote:

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Originally posted by may73alliance

quote:

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Originally posted by A. Madsen
3, 12, 27, 48, 75, 108, 147

---

ok, how the hell you get that plus thats only part A

---

The difference between 2 numbers is incresing with 6 every number.
The difference between 3 and 12 is 9
The difference between 12 and 27 is 15

The difference between 9 and 15 is 6

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ahhh man missed easy marks on my exams then, lol.... seems simple now i know how it works.... thanks


still.....whats it in terms of n then

well its n - (n-1)=6  but i cant rememebr how to make it so its n= ??

n- (n-1) = 6
n -n +1 = 6
0=5?

It doesnt work out...

Hi may73alliance

The formula to calculate term n is (n^2) * 3.

Hope ur gonna have a good grade on this