CONCURRENT numbers are placed in alternate position like in 4 + 9 + 3 + 6 = 9463, the PLACE of 4 & 9 and 3 & 6 are interchanged.Similarly for 1 + 5 +7 + 6 = 5167 the place of 1, 5 and 7, 6 are interchange.Thus 9 + 5 + 4 + 2 will be equal to 5924.