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6. Find the sum of the first ten terms of the arithmetic sequence 3, 6, 9, 12, ..
A) 164
B) 165
C) 166
D) 160​

Sagot :

BAGUISTAHOTWARRIORIN

Answer:

... A. po ang sagot jan ..

CHRISTIANLOUISEDEOCAIN

Answer:

Sn=165

Step-by-step explanation:

givens:

a10=?

a1=3

a2=6

a3=9

a4=12

d=a2-a1=6-3=3

d=3

formula:

Sn=n/2[2(a)+(n-1)d]

solution:

Sn=n/2[2(a)+(n-1)d]

Sn=10/2[2(3)+(10-1)3]

Sn=10/2[6+(9)3]

Sn=10/2[6+27]

Sn=10/2[33]

Sn=165

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