Question

20th term of A.P. : 10,8,6,4,....


plz ans fast​

Answer 1

Answer:

Given A.P.- 10,8,6,.....

First term (a)=10

Common difference (d)=8−10=−2

a

n

=−28

As we know that in an A.P., n

th

term is given as-

a

n

=a+(n−1)d

Therefore,

−28=10+(n−1)(−2)

−28−10=(−2)(n+1)

⇒n+1=

−2

−38

⇒n=19+1=20

Answer 2

a = 10

a2-a1 = 8 - 10 = -2

a20 =?

an = a+(n-1)×d

a20= 10+(20-1)×-2

a20= 10+(19)-2

a20=10-38

a20= -28

answer =

# a20 = -28