Question

Find the 11th term of the ap: 15, 12,9.........

Answer 1

Answer:

heya mate there's your answer

given series 15,12,9............ are in AP

first term a1=15

second term a2=a1+(2-1)d

where d is common differencesl

a2=a1+(2-1)d

12=15+d

d=-3

11th term , a11=a1+(11-1)d

=15+10d

=15+10(-3)

=15-30

=-15

hope it helps you

Thank you

Answer 2

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-15

Step-by-step explanation:

Given AP 15 , 12 , 9 , ........

First term a = 15

Common difference  = second term - first term

                                   = 12 - 15

                                   = -3

We have to find 11th term.

We have formula for term.

$t_n=a+(n-1)d\\\\\\\where \ a=first \ term\\\\\\n=number \ of \ term\\\\\\d=common \ differenve\\\\\\putting \ values \ here\\\\\\\t_{11}=15+(11-1)-3\\\\\\t_{11}=15-30\\\\\\t_{11}=-15$

Thus 11th term is -15.