Question

a2=13; a4=3 find a1‚a3​

Answer 1

Answer:

a2=13 and a4=3

difference between them is 10

if it is a series then a3=half of 10 that is 5

and a1 should be 18

Answer 2

Step-by-step explanation:

a2=a+d=13

A4=a+3d=3

by solving both equations

a get cancel

-2d=10

d=-5

a+(-5)=13

a=13+5=18

A1=18

A3=a+2d

=18+2(-5)

=18-10=8