Concept:In a number series, the wrong term is found by checking the pattern of differences between successive terms.Explanation:Given series: 58,57,54,50,42,33,22.The successive differences are:58−57=1,57−54=3,54−50=4,50−42=8,42−33=9,33−22=11.The differences should follow the odd-number pattern 1,3,5,7,9,11.So the term 50 is incorrect.Replacing 50 with 49 gives:54−49=5,and the pattern becomes 1,3,5,7,9,11.Thus, the correct replacement is 49.Answer:Option B: 49