Python Coding Challenge - Question with Answer (ID 280826)

 

Explanation:

1. Create the Set

x = {i*i % 5 for i in range(10)}

This is a set comprehension. Python will calculate i*i % 5 for every value of i from 0 to 9.

2. range(10)

range(10)

Generates numbers from:

0, 1, 2, 3, 4, 5, 6, 7, 8, 9

So i takes each of these values one by one.

3. Calculate i*i % 5

Now Python calculates the expression for each value:

i i*i i*i % 5

0 0 0

1 1 1

2 4 4

3 9 4

4 16 1

5 25 0

6 36 1

7 49 4

8 64 4

9 81 1

The resulting values are:

0, 1, 4, 4, 1, 0, 1, 4, 4, 1

4. Why Does the Set Remove Duplicates?

The { ... } syntax creates a set.

A set automatically keeps only unique values.

So:

0, 1, 4, 4, 1, 0, 1, 4

becomes:

{0, 1, 4}

Therefore:

x = {0, 1, 4}

5. len(x)

len(x)

len() counts the number of elements in the set.

The set contains:

0 → 1 element

1 → 1 element

4 → 1 element

So:

len(x) = 3

6. print()

print(len(x))

The calculated value 3 is displayed.

✅ Final Output

3

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