Question

in an AP 3rd &7nth terms are 5.7 respectively find AP.​

Answer 1

Answer:

a3= 5

a7 = 7

a+2d = 5

a+6d = 7

-4d = -2

d = 1/2

a+2(1/2) =5

a+1 = 5

a = 4

Answer 2

an=. a+(n-1)d

5=a + 2d. -------1

7= a +6d. -------2

eq 2- eq 1

4d=2

d=1/2. -------3

from eq 1 and 3

a = 5 -2d = 5 - 1

a = 4

AP= 4,4.5,5,5.5