Sir for when sum of 4 unknown consencutive terms of an ap is given the

1.	Sir for when sum of 4 unknown consencutive terms of an ap is given then we take it as a-3d,a-d,a+d,a+3d.why dont we take it as a-2d,a-d,a+d,a+2d. Does this have to do any thing with odd and even. Please explain. Thak you.
Answer» Sir for when sum of 4 unknown consencutive terms of an ap is given then we take it as a-3d,a-d,a+d,a+3d.why dont we take it as a-2d,a-d,a+d,a+2d. Does this have to do any thing with odd and even. Please explain. Thak you.

Sir for when sum of 4 unknown consencutive terms of an ap is given then we take it as a-3d,a-d,a+d,a+3d.why dont we take it as a-2d,a-d,a+d,a+2d. Does this have to do any thing with odd and even. Please explain. Thak you.

Answer»

Sir for when sum of 4 unknown consencutive terms of an ap is given then we take it as a-3d,a-d,a+d,a+3d.why dont we take it as a-2d,a-d,a+d,a+2d.

Does this have to do any thing with odd and even.

Please explain.

Thak you.