if the tenth term of A.P is fifteen and fifteenth term is 10 then 4th term is
Anonymous:
21
Answers
Answered by
2
Answer: 21
Step-by-step explanation:
a + 9d = 15
a + 14 d = 10
solving these equations, we get
5d = -5
= d = -1
so, a-9 = 15
= a = 15+9 = 24
4th term = a + 3d = 24-3 = 21
Pls mark as Brainliest
putting value of d in a+9d=15 , we get a-9=15
so a= 15+9 = 24
how u got d is equal to -1
sorry
we got 2 equations in the first 2 lines, right?
thank u very much
your welcome
pls mark as Brainliest now........
i marked it
yeah , thanks a lot!!
Answered by
1
a10=15
a+9d=15 _(1)
and a15=10
a+14d=10_(2)
subtracting 1 from 2,
14d-9d=5
5d=5
d=-1
a=15-9×-1
=15+9
=24
a4=a+3d
=24-3
=21
a+9d=15 _(1)
and a15=10
a+14d=10_(2)
subtracting 1 from 2,
14d-9d=5
5d=5
d=-1
a=15-9×-1
=15+9
=24
a4=a+3d
=24-3
=21
Similar questions