Answer:
The first multiplier is the number of terms being added.
The second multiplier is one more than the first multiplier, that is
2 + 4 + 6 + 8 + 10 ← has 5 terms being added and 6 is one more than 5, thus
2 + 4 + 6 + 8 + 10 = 5 × 6
see explanation
Explanation:
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