There are 28C6 = (28*27*26*25*24*23)/(6*5*4*3*2*1) = 376,740 sets.
6 and 28
28/ 42 ; Multiply 7 on both and get 4/6 ; multiply both numbers by 2 and you get 2/3
Oh, what a happy little math problem we have here! To get to 28 using the numbers 3, 2, 6, and 8, we can simply multiply 3 by 2 to get 6, then add 6 and 8 to get 14, and finally multiply 14 by 2 to reach 28. Just like painting, sometimes all it takes is a few simple steps to create something wonderful!
Here are some groups to which some of the numbers belong. Prime numbers: 2, 3, 5, and 7. Composite numbers: 4, 9, 10, 15, 21, 25, 28, and 49. Even numbers: 2, 4, 10, and 28. Odd numbers: 3, 5, 7, 9, 15, 21, 25, and 49. Triangular numbers: 3 (or 1+2), 10 (or 1+2+3+4), 15 (or 1+2+3+4+5), 21 (or 1+2+3+4+5+6), and 28 (or 1+2+3+4+5+6+7) Square numbers: 4 (or 22), 9 (or 32), 25 (or 52), and 49 (or 72). Perfect number: 28 (sum of its proper divisors 1 + 2 + 4 + 7 + 14 is itself). Factorial numbers: 2 (or 2!) and 6 (or 3!).
the perfect numbers are: *6 *28 *496 the sums are to make 6 1 + 2 +3=6 1,2,3 are the factors of 6 1 + 2 + 4 + 7 + 14 = 28 1,2,4,7 & 14 are the factors of 28 4 + 2 + 1 + 8 + 16 + 31 + 62 + 31 + 62 +124 +248=496
This sort of number is a factor, which means 28 can be divided by the number and the quotient will have no remainder. Factors of 28 are 28, 14, 7, 4, 2, and 1.
The numbers are 1, 2, 3, 6.
2 numbers have a gcf of 3 = 3 & 6, 6 &9,...
The number is two.
They are both perfect numbers. A perfect number is one whose factors (except for the number itself) add to equal the number.6 = 1 + 2 + 328 = 1 + 2 + 4 + 7 + 14They are also both triangular numbers - sums of the integers in sequence.1 = 11 + 2 = 31 + 2 + 3 = 61 + 2 + 3 + 4 = 101 + 2 + 3 + 4 + 5 = 151 + 2 + 3 + 4 + 5 + 6 = 211 + 2 + 3 + 4 + 5 + 6 + 7 = 28
The greatest common factor of the numbers 48 and 42 is 6.The GCF is: 6