20150524 (Sun)-JC1C Method of difference by Gary Ang | May 24, 2015 | 16JC2C, Board-casts | 0 comments [vimeography id="137"] We did more questions on Method of difference from Summation tutorial Q4, 5, 6 and 9. Submit a Comment Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Save my name, email, and website in this browser for the next time I comment. Δ