alleryStart learning →Which number is square-free?
A21
B18
C12
D20
Answer & Solution
Correct answer: A. 21
21 = 3 x 7 has no square divisor besides 1, whereas 12 and 20 are divisible by 4 and 18 by 9.
Keep practising Semantic, Symbolic/Number and Figural Classification
Browse all Semantic, Symbolic/Number and Figural Classification questions for SSC CGL, or explore more Reasoning topics.
Related questions
A 3-gon is the same as which common shape?Every interior angle of a convex polygon isWhich of these polygons has the most sides?A polygon has 12 sides. How many corners does it have?The word polygon comes from Greek roots meaningA line that meets a polygon's boundary more than twice shows the polygon isAn edge-transitive polygon is calledWhich term means all corners of a polygon lie within the same symmetry orbit?