Why do mobile numbers in India have 10 digits ?
Why do mobile numbers in India have 10 digits ?
The answer, as expected, lies in Mathematics
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From 10 digit mobile numbers, we have 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 = 10,00,00,00,000 = 10 billion numbers at our disposal.
That is Permutations & Combinations Chapter at work
So what is Permutations & Combinations?
When the order doesn't matter, it is a Combination.
Ex. My salad is a combination of
When the order does matter it is a Permutation.
Ex. My password is M@th$
Did you know Niue has 4 digit tel no.s ?
Niue an island country, 2,400 kilometers off New Zealand
As it's population is 1,638
Mainland China has 11 digit mobile numbers
Permutations & Combinations is part of Discrete mathematics ...one of the most important courses in Computer Science.
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