If the sum of first n terms is
- If the sum of first n terms is 4n n2
- If the sum of first n terms is n2
- If the sum of first n terms is 3n2+5n find its common difference
- If the sum of first n terms is cn 2
- If the sum of first n terms of ap is 4n n2
- If an ap the sum of first n terms is 3n2 2 5n 2
- If the sum of first n terms of ap is n2
- If an ap the sum of first n terms is 3n2 2 13n 2
- If an ap the sum of first n terms is 5n2 2 3n 2
- If the sum of first n terms of ap is cn2
- If the sum of first n terms of an ap is 1 2 3n2 7n
- If the sum of first n terms of an ap is given by sn 3n2 2n
- If the sum of first n terms of an ap is an bn 2 where a and b are constant
- If the sum of first n terms of an ap is 3n2 4n
- If the sum of first n terms of an ap is 5n 2 3n