Post a New Question

maths

posted by on .

use the digits 8,6,1 &4 once each.Arrange the digits to make a 4- digit number.How many different 4-digit numbers can you make that are divisible by 7 with no remainder ?

  • maths - ,

    I don't see a short-cut. Could this just be division practice?

    I make it two such numbers of 24 possibilities, one of which is 4186, and the other is predictable from that because 8 mod 7 = 1, and the equation (1000a + 100b + 10c + d = 0 mod 7) works out to (6a + 2b + 3c + d = 0 mod 7). But I still don't quite understand the intent behind the question. Maybe I'm missing something.

Answer This Question

First Name:
School Subject:
Answer:

Related Questions

More Related Questions

Post a New Question