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Maths Puzzle
Numerical Ability
a line passes through a(1,-3) and b(2,7)
write the equation of a line perpendicular to a. how would you go about solving this problem?
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book Other Question
x=1,y=-2
3x^2y-4xy^2+xy
How do i find the nth rule when a3=15 and a11=5 (the 3 & 11 are subscripts)