Answer:
21
Explanation:
The values of c that make it into the loop are 1, 4, 7.
The values that are added to sum are 3 higher, i.e., 4,7 and 10.
The sum of those is 21.
p.s. why did you not run the program yourself?
See how long I can hold the key down. I forgot there was a max :/
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Table tool? i think because it gives more info