2.3.4.15.12
3.4.5.28.20
4.5.6.45.30
5.6.7.a .42
6.7.8.91.56
Value of a ? Choose the correct answer:  A) 65  B) 66  C) 67  D) 68  E) 69
2.3.4.15.12   3.4.5.28.20   4.5.6.45.30   5.6.7.a .42   6.7.8.91.56 so check each colounm u will find the increasing diff...in 'a' coloumn the diff is of 4..means 15...then 28 diff is of 13..then next term can b find out by adding 4 in 13..means add 17 to 28 u get 45 then same way keep on...   ANSWER:66
<result>B</result>
2.3.4.15.12
3.4.5.28.20
4.5.6.45.30
5.6.7.a .42
6.7.8.91.56
Value of a ?