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4 May, 02:40

Find S7 for 3 + 8 + 13 + 18 + ...

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  1. 4 May, 02:58
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    A = 3

    d = 8-3

    =5

    S7=n/2[2a + (n-1) d]

    S7=7/2[2 (3) + (7-1) 5]

    S7=3.5 (6+30)

    =126

    sorry if im wrong
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