Latest Tech Mahindra Aptitude Question SOLUTION: How many number are immediately preceded and immediately followed by different numbers? 7 7 7 5 7 5 7 5 7 7 7 7 5 7 5 7 5 7 7 7 7 7 5 7 5 a) 2 b) 3 c) 4 d) 5 e) 1