(Q14).For the AP :
1
4
 ,
-1
4
 ,
-3
4
 ,
-5
4
 ........, write the first term a and the common difference d. And find the 7th term

Here, a =
1
 ; d =
-1
 -
1
 =
-1

Remember that we can find d using any two consecutive terms, once we know that the numbers are in AP

The seventh term would be =
-5
4
 -
1
2
 -
1
2
 -
1
2
 =
-