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mak7ir6JWestiny
mak7ir6JWestiny mak7ir6JWestiny
  • 21-07-2016
  • Mathematics
Answered

Find the indicated term of the given arithmetic sequence.


a[1]=45, d=-6, n=8

A309
B-3
C3
D87

Verified Answer :

dalendrk
dalendrk dalendrk
  • 24-07-2016

\(a_n=a_1+(n-1)d\\\\a_1=45;\ d=-6\\\\a_n=45+(n-1)\cdot(-6)=45-6n+6=51-6n\\\\\boxed{a_n=51-6n}\\\ =8\\\\a_8=51-6\cdot8=51-48=3\\\\\boxed{a_8=3}\to\fbox{c.}\)

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