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What is the average of the first six (positive) odd number each of which is divisible by 7?
Answer & Solution
Correct Answer:
Option
A
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
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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