Question:
What is the sum of the first 12 terms of an arithmetic progression if the first term is 5 and last term is 38?
A73
B258
C107
D276
Answer:
B. 258
Explanation:
Number of terms = n = 12 ⇒ Sn = 12/2{5 + 38} ⇒ Sn = 6{43} ⇒ Sn = 258
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