Exam Maths Puzzle Numerical Ability

If 10 base Cx=1, what is the value of X, if X NOT EQUAL to 0?
a, 1
b, 5
c, 10
d, 15

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Exam Other Question

graph y=2x-3
graph x=-3
graph x+2y=6
graph y=-x+3
graph y=1.5x
graph y=2/3x-2
graph x+2y=2
graph y-x=1
graph x=-2
graph y=1/5x-1
graph 2x-y=1
graph y=-1.5x
graph x-3=0 The first three terms of the binomial expansion of (a+b)^n are 729,2916,4860 respectively, where a, b, and n are positive integers. Find a, b, n. Show working steps.