Classify the following as finite, infinite, singleton, or null sets. Also give the cardinal number of each set.
$Q = {0, 1, 4, 9, 16, 25, 36, 49, . . . . . .}$

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Solution

The set $Q$ is a infinite set because collection of squares of all whole numbers in infinite.
Hence, n(Q)= $\infty$

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