Question

for fixing one molecule of co2 in kalvin c4 cycle is
3ATP+1NADPH2
2ATP+3NADPH2
3ATP+2NADPH2
3ATP+3NADPH2

Answer 1

It would be 3ATP+ 2NADPH2
If you look at the equation for the Calvin cycle: http://en.wikipedia.org/wiki/Calvin_cycle you can see this relationship.

The amount of energy gained from 1 molecule CO2 entering the Calvin cycle is not changed by the C3 or C4 pathway.

Answer 2

actually I am now a little confused the product of the Calvin cycle in NADP+ not NADPH2..

Answer 3

ionization explains that.