Question

Given , a
3
​
=15,s
10
​
=125 find d and a
10
​

Answer 1

Answer:

(2)-2\times (1) gives

∴d=−1

From (1) we get,

a=15−(−2)=17

a =a+9d

=17+9(−1)=8

Answer 2

Answer:

(2)-2\times (1) gives

∴d=−1

From (1) we get,

a=15−(−2)=17

a =a+9d

=17+9(−1)=8