Question

In Ap s4=20and s5=47 find 5th term​

Answer 1

Step-by-step explanation:

27 is right answer........

Answer 2

Answer:

sn= n÷2(2a+(n-1)d)

20= 4/2(2a+3d)

2a+3d=10

47=5/2(2a+4d)

94/5=2a+4d

2a+4d=94/5

2a+3d=10

_____________

d=94/5 - 10/1

d=94-50/5

d=44/5

2a+3(44/5)=10

2a=10-132/5

2a= -82/5

a= -41/5

an=a+(n-1)d

a5= -41/5+(4×44/5)

= 176/5-41/5

=176-41/5

= 135/5

= 27