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Jalishapink

  • 2 years ago

what is the sum of term of the series(-1)+(-2)+(-3) + + (-10) what is the sum of the first five terms of the series 35+30+25 + what is the sum of the last four terms of the series 7+9+11+ + 21 what is the sum of the first terms of the series 7+12+17+

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  1. ganeshie8
    • 2 years ago
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    (-1)+(-2)+(-3) + + (-10) start by identifying the common difference of this series ?

  2. gudden
    • 2 years ago
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    use AP for the purpose... formula that would be used here is (n/2)(2a+(n-1)d) where n = no. of terms a = first term of the AP and d = common difference

  3. Jalishapink
    • 2 years ago
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    thank you

  4. gudden
    • 2 years ago
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    you r welcome

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