The partial variation is A
Since each girl gets 11 sticker that means that there are 22 stickers in the pack.
11x2=22
The summation symbol means we use the variable i in the equation from the given range. In this case, we are given with the equation 3 i - 15 and i ranges from 2 to 7. The summation using simply the calculator is equal to -9. The answer to this problem is -9.
It would be D
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