The difference between 13 and 5 is 8.
13 - 5 = 8 (check sum is 8 + 5 = 13)
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By subtracting one term from the next the common difference can be found: Using -8 and -13: -13 - -8 = 13 + 8 = -5 → Common difference is -5.
The sum of 8 and 5 is 13 The difference of 8 and 5 is 3 So the question is what is the product of 13 and 3 13 X 3= 39
13 and 8 13 + 8 = 21 13 - 8 = 5
Sum of 9 and 4 = 13 Difference of 9 and 4 = 5 Product = 13 x 5 = 65.
8 and 5