Question

For
an A.P. ,if t4 = 20 and t7= 32 Find a, d, tn​

Answer 1

Answer:

d = 4.

a= 8

tn= 4(1+n)

Step-by-step explanation:

t4=20. ,t7=32

a+3d=20. ,a+6d=32

20-3d. =32-6d

3d = 12

d=4

a=8

tn=8+(n-1)4

8+4n-4

4+4n

4(1+n)