How can I randomly assign addition or subtraction in a for loop?

Does anyone have any ideas for how I can randomly assign a for loop to add or subtract random numbers throughout various itterations? My current code generates two random numbers and adds them together for a set number of itterations. I need some random itterations to be subtraction. Thanks in advance!
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Add another Random Number generator and compare the result against 0.5. Use a case structure around your addition/subtraction operator.
Seems like you might also want to output which operation actually got picked.

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How can I randomly assign addition or subtraction in a for loop?

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