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Mathematics 11 Online
OpenStudy (anonymous):

Find S7 for 3 + 8 + 13 + 18 +… A.116 B.121 C.126 D.131

OpenStudy (anonymous):

3+(3+5)+(3+5+5)+(3+5+5+5)+.... this way made 7 terms and by adding one 5 in each ... and at the end add them

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