exam Maths Puzzle Numerical Ability

Which of the following represents an odd number for any integer n?
f.n+1
g.2n+1
h.3n
i.3n+1

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exam Other Question

A 6000 lb SUV is being winched up a ramp onto a flatbed trailer. If the ramp is at a 25 degree angle, how much force will be required by the winch to pull the SUV up the ramp? 2x+y+4=0
x-y+2=0

Note to student: i have changed your equations by adding =0 to each one. There is no other way to have a linear equation - in an equation there is always an equal sign.