Day6 #IBMath Ss showed for an arith seq S_n - S_n-1 = U_n. At least 4 valid methods appeared. So simple but interesting! #teach180
— Emily Sliman (@EmilySliman) August 23, 2017
Day6 #IBMath Ss showed for an arith seq S_n - S_n-1 = U_n. At least 4 valid methods appeared. So simple but interesting! #teach180
— Emily Sliman (@EmilySliman) August 23, 2017
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