Question

For an A.P, the third term is 7 and the fourth term is 3. Find the common difference and the first term​

Answer 1

Answer:

a=15, d=-4

Step-by-step explanation:

given

a3=7

a4=3

common difference = a4-a3

= 3-7

= -4

so d=-4

a3= a+(3-1)-4

7=a+(2*-4)

7=a-8

a=7+8

a=15