malachi336 malachi336

27-06-2022
Mathematics

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senayalem5513 senayalem5513

27-06-2022

Step-by-step explanation:

this is first an arithmetic sequence with the first term A1=3(1)+1=4 And the 12th term A12=3(12)+1=37. Then use this formula

S12=12/2 ×(4+37)

=6×41

=246

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