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musickatia [10]
2 years ago
7

Please help asap6918

Mathematics
1 answer:
WINSTONCH [101]2 years ago
3 0

Answer:

18

Step-by-step explanation:

The value of n = 1 , 2 , 3. Find the first 3 term and add them.

3*1 + 3*2 + 3*3 = 3 + 6 + 9

                         = 18

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