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Find 6 + 9 + 12 + . . . + 30
Option: 1
160

Option: 2
165

Option: 3
162

Option: 4
125

Answers (1)

best_answer

a = 6

l = 30

d = 9 – 6 = 3

n=(1−a)/d+1=(30−6)/3+1=24/3+1=8+1=9

Sum, S =n/2[a+1]=9/2[=6+30]=9/2×36=9×18=162

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