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arithmetic

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Find the sum of the first 40 terms of the arithmetic sequence. 19, 24, 29, 34

  • arithmetic -

    dude why do you put su hard question on here and nobody can do it

  • arithmetic -

    In wikipedia type
    "Arithmetic progression"
    you wil find everythink about Arithmetic progression

    Sn=sum of numbers

    Sn=(n/2)*[2a1+(n-1)*d]
    In this case:
    n=40
    a1=19
    d=5
    S40=(40/2)*[2*19+(40-1)*5]=20*(38+39*5)=20*(38+195)=20*233=4660

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