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  • Find 6 + 9 + 12 + . . . + 30Option: 1 160Option: 2 165

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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