How many different 3-digit numbers can be made using each of these digits shown below only once? 3,6,9
OA 3
O B. 6
Oc. 8
OD 10
O E more than 12

answer

d. 10

explanation

the distance from point y to wx is the height of the triangle.

using pythagoras theorem,

group similar terms to get,

this implies that,

take positive square root of both sides to get,

this implies that,