Question

Sum of first five terms of an ap is 25 ,sum of next 5 terms us -75.Find 10th term of the ap

Answer 1

25=2a+4d

2a+9d-(2a+4d)= -75

5d=-75

d= -15

a=85/2

10term = 85/2 + 9*(-15)

= -92.5 ans.

Answer 2

Step-by-step explanation:

d=5,s

9

=75

s

9

=

2

9

[2a+(9−1)5]

75=

2

9

[2a+40]

150=9[2a+40]

150=18a+360

150−360=18a

−210=18a

18

−210

=a

a=

3

−35

a

9

=a+(9−1)5

a

9

=

3

−35

+40

a

9

=

3

−35+120

a

9

=

3

−85

Hope its help .