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24 August, 13:41

Find S5 for the sequence 3, 13, 23, 33, 43, 53, 63, 73.

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  1. 24 August, 13:47
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    have an arithmetic sequence here ... to find the common difference, subtract the first term from the second term. 13 - 3 = 10 ... so basically, ur adding 10 to each number to get to the next number.

    before we find s5, we r going to find a5 ... because we need a5 to use in the sum formula ... a5 is the fifth term, and it is 43

    sn = (n (a1 + a5) / 2

    s5 = (5 (3 + 43) / 2

    s5 = (5 (46)) / 2

    s5 = 230/2

    s5 = 115 <===

    or, for this particular problem, s5 is the sum of the first 5 terms.

    3 + 13 + 23 + 33 + 43 = 115 ... u can do it this way for s5 ... but if u were asked to find s20, I suggest using the formula.
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