The access code for a cars security system consists of four digits?

May 12, 2011

By admin

the access code for a cars security system consists of four digits. the first digit cannot be 5 and the last digit must be even or zero.

how many different codes are avaliable?

can anybody help me with this problem?

6 Responses to “ The access code for a cars security system consists of four digits? ”

1. 

   Colin on May 11, 2011 at 6:35 am

   4 digits implies 0000 to 9999

   -that’s 10,000 possibilities

   But the first digit cannot be 5, so 5000 – 5999 are out.

   That leaves 9,000 possibilities.

   The requirement for the last digit to be 0 2 4 6 8 (not 1 3 5 7 9) halves the possibilities again.

   So I think the answer is 4,500<<<<

   Reply
2. 

   Lloyd J on May 11, 2011 at 7:58 am

   9X10X10X5 = 4,500

   Reply
3. 

   VFBundy on May 11, 2011 at 9:30 am

   9 * 10 * 10 * 5 = 4500

   —————————————————

   Reply
4. 

   Fazaldin A on May 11, 2011 at 9:33 am

   Here we have,

   5 x x 0 = 100 codes

   5 x x 2 = 100 codes

   5 x x 4 = 100 codes

   5 x x 8 = 100 codes
   —————————
   Total Codes = 400 CODES >==============< ANSWER

   Reply
5. 

   Hayden W. on May 11, 2011 at 9:42 am

   0-10=10 digits that can be used
   (9)(10)(10)(6)=5400 ways

   Reply
6. 

   Moise Gunen on May 12, 2011 at 4:23 am

   9*10*10*5 = 4500

   Reply