Question

which term of the AP 21 ,18,15 is -81​

Answer 1

Answer:

answer is 35th term

Step-by-step explanation:

an = (-81),a = 21 and d= 18-21 = (-3)

putting these values in

an = a+(n-1) d

(-81) = 21+(n-1)(-3)

(n-1) (-3)= -81-21

n-1 = -102/-3

n-1= 34

n= 34+1

= 35

Hence, 35th term of AP is (-81)

Answer 2

Answer:

35th term

Step-by-step explanation:

a1 = 21

d = 18-21 = -3

a

n = -81

a + (n-1)d = -81

21 + (n-1) (-3) = -81

(n-1) (-3) = -81-21

(n-1) (-3) = -102

(n-1) = 34

n = 34+1

n =35

hence -81 is the 35th term of the given AP.

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