Question

if the tenth term of A.P is fifteen and fifteenth term is 10 then 4th term is

Answer 1

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

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Answer 2

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