Find the sum of first 8 multiples of 3
Arithmetic Progressions (10)Find the sum of first 8 multiples of 3.
Answer
S = 3 + 6 + 9 + 12 + ... + 24
= 3(1 + 2 + 3 + ... + 8)
= 3 x $ \frac{8 \times 9}{2} $
= 108
Exam Year:
2018
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