What is the sum of the first 12 terms of an arithmetic progression if the first term is 5 and last term is 38?
What is the sum of the first 12 terms of an arithmetic progression if the first term is 5 and last term is 38? Correct Answer 258
Formula used:
Sum of A.P. = n/2{first term + last term}
Calculation:
Number of terms = n = 12
⇒ Sn = 12/2{5 + 38}
⇒ Sn = 6{43}
⇒ Sn = 258
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Feb 20, 2025