PRC-2 · Chapter 3 · Question 15 of 45
In an arithmetic progression, the first term is 10 and the common difference is 2. Which equation accurately models finding the number of terms 'n' needed to produce a sum of 252?
Test yourself: pick an answer
Reveal answer & explanation
Correct answer: A) 252 = n(20 + (n-1)2) / 2
Explanation
Using the arithmetic sum formula Sn = (n/2)[2a + (n-1)d]. Substituting the specific values given (Sn=252, a=10, d=2) results in the equation 252 = (n/2)[20 + (n-1)2].
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