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Jan
30
awarded  Autobiographer
Nov
20
comment How many 4 digit numbers can be made with exactly 2 different digits
when 0000 and 1111 is not allowed then (2^4)-2 = 14 ?
Nov
20
answered How many 4 digit numbers can be made with exactly 2 different digits
Nov
20
awarded  Supporter
Nov
20
awarded  Teacher
Nov
20
answered How to evaluate $\int {\frac{{\cos {x^3}}}{x}dx}$