What is the average of the first six (positive) odd number…

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What is the average of the first six (positive) odd number each of which is divisible by 7?

  1. A. 42
  2. B. 43
  3. C. 47
  4. D. 49

Answer: Option A

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Solution(By ExamCraze Team)

According to the question,
First six odd numbers which are divisible by '7'
7, 21, 35, 49, 63, 77
difference in each value is 14
Sn = $$frac{n}{2}$$ [2a + (n - 1) d]
Sn = $$frac{6}{2}$$ [2 × 7 + (6 - 1) × 14]
Sn = 3 (14 + 70)
Sn = 252
∴ Average = $$frac{252}{6}$$ = 42

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