exam Maths Puzzle Numerical Ability

i need to find the sum of the first nth terms of the arithmetric series.
3+8+13+18+23
n=20

Sn=366

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exam Other Question

How to sketch a figure that shows a line that intersects two nonintersecting planes. The sides of an angle inscribed in a circle are
A. two chords
B. Two Radii
C. A diameter and tangent
D a tangent and a radius