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Pick three numbers. If the square of the largest number is equal to the sum of the squares of the other two, then the three numbers could represent the sides of a right triangle.
no
There are 4 digits. You can pick one of them as the first digit. So you can pick the first number 4 ways. Having picked the first number, the second number you can pick in only 3 ways. Having picked the first number and the second number you can pick the third number in only 2 ways. Having picked the first number and the second number and the third number you can pick the fourth number in only 1 way. So total ways of arranging 1468 would be 4 x 3 x 2 x 1 = 24
3.Any three points will determine a plane, provided they are not collinear. If you pick any two points, you can draw a line to connect them.
draw a line. pick an arbitary point "0" and put another arbitrary point to the right of "0" mark the point and write 18 underneath it