Question

Which term of the Ap 21 ,18,15......-81

Answer 1

Answer:

a=21

d=18-21=(-3)

-81=a+(n-1)d

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

-81=21-3n+3

3n=81-24

3n=57

n=19

19th term of ap is -81

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Step-by-step explanation:

Answer 2

Answer: 35th term

Step-by-step explanation: ap = 21,18,15.......-81

                                            a= 21   d= -3  an= -81

                        an = a +  (n-1)d

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

                          on simplifying we get -102/-3 = n-1

                                                                34 = n-1 = n = 34 +1

                                                                     n = 35