Lets suppose you choose your 2 digit number as 'ab'.
Its numeric value = 10a + b
Now add the digits = a + b
Now subtract them = 10a + b - (a + b)
= 10a + b - a - b
So the answer is always a multiple of 9: 9, 18, 27, 36, etc. You'll notice that multiples of 9 always have the same symbol on the final symbol map.
The clever thing is that they switch the symbols around each try.
Sorry to be so late: I've only just joined.
MY India: Why India is in trouble?
With a population of 100 Crore
9 Crore are retired
22 Crore are in school
30 Crore are in state government
15 Crore are unemployed
1 Crore are under 5 years of age
3 Crore are any time travelling
17 Crore in Central Government (who don't work)
1 Crore are IT Professional (they don't work for India)
1 Crore you can find any time in the hospital (statistics says you cannot find...)
99,99,998 are people any time in jail
The rest are TWO PEOPLE: YOU AND ME
You R busy with U r mobile
SO HOW CAN I HANDLE India ALONE ... !
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