Question

how can I write 1*3*5*7...???

Answer 1

You can use our Equation Editor (link below). Unfortunately, at the moment this is not part of the asking a question process, but you can clarify after you ask your question. Also, if you are familiar with Latex, you can use that when asking your question.

There are some tips for using this here: ftp://ftp.ams.org/ams/doc/amsmath/short-math-guide.pdf

Answer 2

ok thnx

Answer 3

1*3*5*7*... is totally ok but if you want more fancy you can write
\[1*3*5*7*...\]
\[1\cdot3\cdot5\cdot7\cdot...\]
\[1\times3\times5\times7\times...\]
unless you meant something else