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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)
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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