D is celebrated on Thursday. The Tech Mahindra celebrates after D. C is celebrating a festival two days before the one who is working in Tech Mahindra. From the above condition, there are two possibilities. 
Only two persons are between the one who works in Infosys and C. The one who works in IBM celebrates on Monday. 
B works in Wipro but not celebrates on consecutive day of C. F neither celebrates after C nor Monday. E is celebrated after C. Neither E nor A is working in Tech Mahindra. 
HCL celebrated two days before TCS. The one who works in L&T does not celebrate on Wednesday. From the above condition, case 1 gets eliminated. 
Case 2 shows the final arrangement 
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