Maths symbol that looks like Sputnik
Solution 1:
I think it is a typesetting problem with the parentheses.
My best guess at the intended question would be:
$$\left( 2-\frac 12 \right) \left( 2-\frac 23 \right) \left( 2-\frac 34 \right) \left( 2-\frac 45 \right)$$
This seems reasonable given the level of the other questions.