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What is the sum of the first 6 terms of the arithmetic series 10, 15, 20, ...?

Practice Questions

1 question
Q1
What is the sum of the first 6 terms of the arithmetic series 10, 15, 20, ...?
  1. 90
  2. 100
  3. 110
  4. 120

Questions & Step-by-step Solutions

1 item
Q
Q: What is the sum of the first 6 terms of the arithmetic series 10, 15, 20, ...?
Solution: The sum S_n = n/2 * (2a + (n-1)d) = 6/2 * (2*10 + 5*5) = 3 * (20 + 25) = 135.
Steps: 0

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