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4, 7, 10, 13,...,S6 find the indicated partial sum for the given sequence​

Sagot :

d=a1-a2

d=7-4

d=3

an=a1+(n-1)d.

a6=4+(6-1)3

a6=4(5)3

a6=4+15

a6=19

Sn=n÷2. (a1+an)

S6=6÷2 (4+19)

S6=3×23

S6=69