How many ATP and NADH₂ are required for the synthesis of one molecule of glucose during Calvin cycle?

The Calvin cycle, also known as the light-independent reaction of photosynthesis, uses ATP and NADPH generated by the light-dependent reactions to fi x carbon dioxide and synthesize glucose. To synthesize one molecule of glucose, the Calvin cycle uses 18 ATP and 12 NADPH+H⁺.
(1) If, in one round of Calvin cycle, instead of 2 NADH₂, 2.67 NADH₂ were utilized, then 16 NADPH₂ would be required. As this is not the case, hence, 12 NADH₂ are required to fi x one molecule of glucose. 

(2) If, in one round of Calvin cycle, instead of 3 ATP, 2 ATP were utilized, then 12 ATP would be required. As this is not the case, hence, 18 ATP are required to fi x one molecule of glucose.

(4) If, in one round of Calvin cycle, instead of 3 ATP and 2 NADH₂, 2 ATP and 2.67 NADH₂ were utilized, then 12 ATP and 16 NADHP₂ would be utilized for producing one molecule of glucose.