arithmetic

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an ap consists of 21 terms.the sum of 3terms in the middle is 129 and of the last three is 237 find the AP.

  • arithmetic -

    21terms/3terms=7groups of 3terms

    237(last group)-129 (middle group)=36

    237(group7)-36=201(group6)
    group6-36
    group5-36
    129(group4)-36=95(group3)
    group3-36
    group2-36
    add up all group terms(237+201+165...)

    Hope that's what your looking for if not sorry, but that should be right

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