Pre-Assessment
Directions: Let us find out how much you know the conoept of fincing the wum of the terms in an arithmetic sequence by answering what is acked in each item below (1 point each).
1. What process deals in getting the sum of the terms of an anthmetic sequenos?
A. arithmetic sequence
B. arthmetic mean
C. arithmetic series
D. common difference
2. Which of the following represents arithmetic series?
A. \( 5,8,11,14,17,20 \)
B. \( 5+8+11+14+17+20 \)
C. \( 2,6,18,54,162 \)
D. \( 2+6+18+54+162 \)
3. What is the formula in finding the sum of an arithmetic sequence?
A. \( \frac{n}{2}(n+1) \)
B. \( \frac{n}{2}\left(a_{1}+a_{n}\right) \)
C. \( a_{1}+(n-1) d \)
D. \( a_{n}-(n-1) d \)
4. Which of the following does not belong to the group?
A. \( 2+5+8+11+14+17 \)
B. \( -20-17-14-11-8-5 \)
C. \( 3+12+36+108+324 \)
D. \( 33+25+17+9+1-7 \)
5. What is the sum of the first 10 terms in the arithmetic sequence \( 7,11,15,- \) ?
A. 43
B. 230
C. 250
D. 500
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