Question
How many pairs of letters are there in the word "HUNGRY"
which has as many letters between them in the word (both forward and backward) as in the English alphabetical series (both forward and backward)?Solution
Backward = RU
6 3.5 2.5 ? 8.5 23.75
...17Â Â Â Â Â ? Â Â Â Â Â 2142 Â Â Â Â Â Â 12852 Â Â Â Â Â Â 64260Â Â Â Â Â Â 257040
...Find the maximum number of trees which can be planted, 25 meters apart, on the two sides of a straight road 2125 meters long
21, 63, 315, ?, 19845, 218295
7, 14, 42, 210, 1470, ?
5 ? 205 823 7405 29623
...123   125   129   132   ?   145
6Â Â Â Â Â Â Â Â Â Â Â Â Â 16Â Â Â Â Â Â Â Â Â Â 116Â Â Â Â Â Â Â Â 566Â Â Â Â Â Â Â Â 2272Â Â Â Â Â Â 6814
13       a  �...
5Â Â Â Â 13Â Â Â Â 36Â Â Â Â 145Â Â Â Â Â 719Â Â Â Â 4321
1,2, 5, ‘?’, 41, 122, 365