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123lal Group Title

Find the sum of the first 38 terms of the arithmetic sequence: 3, 8, 13, 18, 23, ...

  • one year ago
  • one year ago

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  1. SandeepReddy Group Title
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    Which series is it?

    • one year ago
  2. Jonask Group Title
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    a=3 n=38 d=5 \[sum=n\frac{(2a+(n-1)d)}{2}\]

    • one year ago
  3. SandeepReddy Group Title
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    Its in the AP, because every next term has a constant difference with the preceding term

    • one year ago
  4. SandeepReddy Group Title
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    So @Jonask Formula holds for it , apply and get the result.

    • one year ago
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