how to find f if cf is given
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If cf is given subtract the successive one by the preceding one
Eg:
Mark. Cf. F.
5. 30. 30-23=7
10. 23. 23-8=15
15. 8. 8-2=6
20. 2. 2
Eg:
Mark. Cf. F.
5. 30. 30-23=7
10. 23. 23-8=15
15. 8. 8-2=6
20. 2. 2
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