Question

Find the odd one out from the series: 9, 9, 65, 25, 215, 49, 513, 81, 1001.

Hint:

Look for numerical patterns (such as squares or cubes) and identify outliers that do not fit.

Answer 1

Step 1: Identify the pattern.
Look at the square numbers in the series: - \( 9 = 3^2 \) - \( 65 \) is not a perfect square. - \( 25 = 5^2 \) - \( 215 \) is not a perfect square. - \( 49 = 7^2 \) - \( 513 \) is not a perfect square. - \( 81 = 9^2 \) - \( 1001 \) is not a perfect square.
The odd one out is 215, as it doesn't follow the pattern of perfect squares like the others.