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What is the sum of the first 15 terms of an arithmetic progression where the first term is 2 and the common difference is 4?

Practice Questions

1 question
Q1
What is the sum of the first 15 terms of an arithmetic progression where the first term is 2 and the common difference is 4?
  1. 120
  2. 130
  3. 140
  4. 150

Questions & Step-by-step Solutions

1 item
Q
Q: What is the sum of the first 15 terms of an arithmetic progression where the first term is 2 and the common difference is 4?
Solution: The sum of the first n terms S_n = n/2 * (2a + (n-1)d). Here, S_15 = 15/2 * (2*2 + 14*4) = 15/2 * (4 + 56) = 15/2 * 60 = 450.
Steps: 0

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