The sum of 21 and 12 is 33.
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21 + 43=74 and 43-21=12, so your answer is 21+43
The probability is 21/36 = 7/12
3 + 6 + 12 = 21 3 x 6 x 12 = 216
-8 × (number + 21) = 96 → number + 21 = 96 ÷ -8 → number = 96 ÷ -8 - 21 = -12 - 21 = -33
21/36 or 7/12 or 58.33...%