method created for 3by2 matrix multiply with 2by1 matrix

Author: Nishitha0730

src/test/java/com/thealgorithms/matrix/MatrixMultiplicationTest.java

@@ -20,6 +20,17 @@ void testMultiply2by2(){
         assertMatrixEquals(expected, result);   // Because assertEquals can fails due to floating point precision issues, Therfore use assertMatrixEquals
     }
 
+    @Test
+    void testMultiply3by2and1(){
+        double[][] matrixA = {{1.0,2.0},{3.0,4.0},{5.0,6.0}};
+        double[][] matrixB = {{7.0},{8.0}};
+        double[][] expected = {{23.0}, {53.0}, {83.0}};
+
+        double[][] result = MatrixMultiplication.multiply(matrixA, matrixB);
+        assertMatrixEquals(expected, result);   // Because assertEquals can fails due to floating point precision issues, Therfore use assertMatrixEquals
+    }
+
+
     private void assertMatrixEquals(double[][] expected, double[][] actual) {
         assertEquals(expected.length, actual.length, "Row count mismatch");
         for (int i = 0; i < expected.length; i++) {