Can someone help me with a question to do with sequences and creating a function file that find n terms of sequence

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Abdullaziz Errayes
Abdullaziz Errayes 2016-12-11
编辑： Roger Stafford 2016-12-12
Can someone show me the function file that would calculate the first n terms of this sequence a_i=a_(i-1)+3i as well as the sum of the first n terms please!

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Roger Stafford
Roger Stafford 2016-12-12
编辑：Roger Stafford 2016-12-12
a = a_0 + cumsum(3:3:3*n); % The sequence of first n terms
s = sum(a); % The sum of these

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