Question

8)For an AP if eighth term =6 ,d=-2 ,then what is the value of a?

7

13

20

27

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Answer 1

An = a+(n-1)d

6=a+(8-1)(-2)

6 = a-14

a=20

:-)

Answer 2

Answer:

eighth term=6

d=_2

1. 6=7a+d

6=7a+(-2)

6=7a-2

6+2=7a

9=7a

a=9/7