Find the sum of the first 15 terms of the arithmetic series 5 + 8 + 11 +
A. 320
C. 315
B. 325
D. None of these
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Find the sum of the first 15 terms of the arithmetic series 5 + 8 + 11 +
A. 320
C. 315
B. 325
D. None of these
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Answer:
Para sa akin wla dyan ung sagot kasi 390 ung sagot po
Step-by-step explanation:
5+8+11+14+17+20+23+26+29+32+35+38+41+44+47 = 390
D. None of these
Common difference:3
n=15
A1= 5
S15 = 15÷2 [ 2 (5) + (15-1) 3]
S15= 7.5 [10 + (14)3]
S15 = 7.5[10 + 42]
S15 = 7.5[52]
S15= 390
Answer:
D. None of these