n m

Σ Σ Xij

i=1 j=1

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- Jan 20th 2013, 06:58 AMnassaufashionistadouble summations:
n m

Σ Σ Xij

i=1 j=1 - Jan 20th 2013, 07:46 AMSorobanRe: double summations:
Hello, nassaufashionista!

What is the question?

Quote:

Are we expected to expand it?

. . . . . . . .

- Jan 21st 2013, 02:43 AMnassaufashionistaRe: double summations:
Ok Thank you! i was looking at another double summation:

2 3

Σ Σ Xij

i=1 j=1

The expansion in my text is as follows:

(x11+x12+{x13}+x21+x22+x23

^i dont understand why the x13 is used because i is only 1 to 2...

can you explain the x13 in parenthesis and explain the expansion I think i may have missed something.