Using square brackets ([]) to retrieve vector elements __________ perform bounds checking; using member function at to retrieve vector elements __________ perform bounds checking.

If you want to force a mathematical operation in a formula to be performed in a different order in Excel, ________ can be used

A) { } B) | | C) ( ) D) [ ]

Usually, a problem is reduced by making the value of a(n) ___________________ smaller with each recursive call

Fill in the blank(s) with the appropriate word(s).