Crux Mathematicorum Vol. 47, No. 3 « v47, n2 indexv47, n4 » March, 2021 PageContents 121 MathemAttic: No. 23 121 Problems: MA111-MA115 123 Solutions: MA86-MA90 129 Problem Solving Vignettes: No.15 — Shawn Godin 135 Olympiad Corner: No. 391 135 Problems: OC521-OC525 137 Solutions: OC496-OC500 143 Lagrange Interpolation — Sushanth Malipati 146 Focus On...: No. 45 — Michel Bataille 151 Problems: 4621-4630 155 Solutions: 4571-4580 Read the issue below Download this issue (PDF) Crux Mathematicorum