How many alphabets need to be there in a language if one were to make 1 million distinct 3 digit initials using the alphabets of the language?  Pick one.
A) 321  B) 65  C) 120  D) 100  E) 80

Rationale: 1 million distinct 3 digit initials are needed . let the number of required alphabets in the language be ‘ n ’ . therefore , using ‘ n ’ alphabets we can form n * n * n = n 3 distinct 3 digit initials . note distinct initials is different from initials where the digits are different . for instance , aaa and bbb are acceptable combinations in the case of distinct initials while they are not permitted when the digits of the initials need to be different . this n 3 different initials = 1 million i . e . n 3 = 106 ( 1 million = 106 ) = > n 3 = ( 102 ) 3 = > n = 102 = 100 hence , the language needs to have a minimum of 100 alphabets to achieve the objective . ans : d
Answer: D