self Maths Puzzle

the pointa A(2,-1,3), B(4,1,0) and G(-3,2,-1) from the vertices of a triangle.D is the mid-point of BC. determine the angle between AD and BC ?

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self Other Question

If (7+4a) & (5+2b) are the digits in the thousands & tens places respectively of the number 98537, then find the value of a & b? How many 3-digit numbers can be formed with the digits 1,4,7,8 and 9 if the digits are not repeated?