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Task/Evaluate-binomial-coefficients/ERRE/evaluate-binomial-coefficients.erre

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+PROGRAM BINOMIAL
+
+!$DOUBLE
+
+PROCEDURE BINOMIAL(N,K->BIN)
+      LOCAL R,D
+      R=1 D=N-K
+      IF D>K THEN K=D D=N-K  END IF
+      WHILE N>K DO
+        R*=N
+        N-=1
+        WHILE D>1 AND (R-D*INT(R/D))=0 DO
+          R/=D
+          D-=1
+        END WHILE
+      END WHILE
+      BIN=R
+END PROCEDURE
+
+BEGIN
+   BINOMIAL(5,3->BIN)
+   PRINT("Binomial (5,3) = ";BIN)
+   BINOMIAL(100,2->BIN)
+   PRINT("Binomial (100,2) = ";BIN)
+   BINOMIAL(33,17->BIN)
+   PRINT("Binomial (33,17) = ";BIN)
+END PROGRAM