March 28, 2015

Homework Help: Problem Solving Math Question

Posted by Krisy on Sunday, August 27, 2006 at 7:53pm.

Find the sum of all the numbers in the following array:

1 2 3 4 5 6........100
2 4 6 8 10 12 ......200
3 6 9 12 15 18 ......300
100 200 300 400 500 600 . . . 100(x)100

Can anyone help me??

I'll suggest how to solve this, but you'll need to do the calculating yourself.
Observe that the first row is:
where row_one is the sum of row one.
If you know how to sum this you'll have no problem doing the rest of the array.
The second row is:
The third row is 3+6+9+...+297+300=3(1+2+3+4...+99+100)=
The sum of the array is then:
row_one +
2*row_one +
3*row_one +

k*row_one (the k-th row) +
Thus the sum of the array is
or row_one^2
Now what is row_one?

Roger, Thank you! I did solve it like that, but it did not look right! I e-mailed my teacher to ask her but, she has not e-mailed me back yet. It is a homework problem for tomorrow. Thanks for letting me know I was right! I am not very good in math! LOL!


anybody cam help this problem.......this is my assignment to be pass tomorrow.... me....

Andy, I'm not exactly sure what your question is. The statement doesn't make sense as it stands.
Can you clarify what you mean here?
Also, you should start a new thread.
Do you see the Post a New Question link above?

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