Question
One way of extending the number system in Method 2 is by using strings with more than one letter — for example, we could use ‘aa’ for 27. How can you extend this system to represent all the numbers? There are many ways of doing it!

Answer

One of the ways of extending the number system in Method 2 by using strings with more than one letter is :
Single letterDouble letter combinationTriple letter combination
a = 1
b = 2
c = 3
....
z = 26
aa = 27
ab = 28
ac = 29
....
az = 52
ba = 53
bb = 54
bc = 55
....
zz = 702(26 x 26 + 26)
aaa = 703
aab = 704
aac = 705
and so on ...

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