# summation and product notation rules

#### lemonthree

##### New member
As per the image, I am supposed to select all the valid statements. Apparently I'm only partially correct, and so I took another look at the statements.

I believe the third statement is wrong, since $$\displaystyle c * (a_m*a_{m+1}*a_{m+2}*...*a_n)$$ =/= $$\displaystyle (c*a_m)(c*a_{m+1})(c*a_{m+2})*...*(c*a_n)$$

Thus there should only be two answers. Am I correct on this?

#### Attachments

• 36.6 KB Views: 9

MHB Math Helper
You are correct.

-Dan