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10) Find the sum of the first 20 terms of the sequence 4, 11, 18, 25.... S 20 =____ 12) Find 1+2+3+4+....+80, the sum of

10) Find the sum of the first 20 terms of the sequence 4, 11, 18, 25....

S20=____

12) Find 1+2+3+4+....+80, the sum of the first 80 natural numbers.

The sum is ____

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