ANSWERS: 4
  • For a four digit odd number using just these digits, you have only 4 choices for the last digit, then 6, 5, 4 for the rest, respectively. 4*5*6*4 = 360.
  • Choose four numbers from 1,2,3,4,5,6,7 The formula for the number of ways of doing that is: 7C4 = (7*6*5*4)/(4*3*2*1) = 35 Now arrange the four numbers in any order. There are 4*3*2*1 ways of doing that That's 35*12 = 840 numbers using numbers from 1-7 with no repeating digit. (1/7) of those will end with 1 = 120 of them. (1/7) of them will end in 2 etc. So 4*120 of them will end in an odd digit and be odd. =480
  • Have no idea. Some clown down rated this question so for the heck of it I gave the question and all answers 4 points each. I thought it was one of the saner inquires and good replies.
  • same question what if its 7 digit number from numbers 1 thru 49 (no two numbers shud repeat in 7 digits)???

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