Question

Find the 27th term of A.P.
9,4,-1,-6,-11,...

Answer 1

Answer:

a=9, d= 4-9= -5

27th term = a+26d

= 9+26×(-5)

=9- 130

= -121

Answer 2

Answer:

a=9

d=4-(9)=-5

n=27

$a {n} = a + (n - 1)d \\ a27 = 9 + (27 - 1) - 5 \\ a27 = 9 + 26( - 5) \\ = 9 - 130 = - 121$

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