Quick Math Question


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Wow, I totally forgot how to calculate the xth term of a series. Whats the formula again?

Ex. First term of a series is -3 and each term after that is 5 more than the previous one (-3, 2, 7, 12...) What is the 101st term?

Answer is 497. How?

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J Wong.. I like the way you solve that...

This is my way for that sort of problem.

-3 , 2, 7, 12 , ....

\ /\ /\ /

5 5 5 ----> 5x

\/ \ /

1 1

the whole equation is 5x - c, when c = (2nd line #) - first initial number = 5 -(-3) = -8

===> y = 5x - 8

I think ......!! :whistle:

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I went through my old notes.. It's this:

the nth term = the first term + (n-1)® where r is whatever you're adding to get the next term (5 in this case).

497 = -3 + 100 (5)

lol. thanks for the help though :p

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