anonymous
  • anonymous
how many positive integers less than 1000 can be written using the digits 3,4,5,6? the answer key says84?
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
integers can be one digit,two digits,three digits. no. of digits=4 (3,4,5,6) no. of one digits=4 no. of two digits=4*4=16 (as unit placebe filled in 4 ways and tens place can be filled in four ways.e.g.,(33,34,35,36,43,44,45,46,47,etc) no. of three digits=4*4*4=64 333,334,335,336,343,344,345,346,353,354,355,356,etc) total no .of integers=4+16+64=?
anonymous
  • anonymous
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