Question

1. what is the output for y?

y = 0
for i in range(0, 8):
y += i
print(y)
28
8
1 2 3 4 5 6 7 8
0 1 2 3 4 5 6 7
0

Explanation:

Step1: Understand range function

The range(0, 8) generates a sequence of numbers from 0 to 7 (not including 8).

Step2: Analyze the loop

The loop iterates through each number i in the range. Initially y = 0, and in each iteration y is updated as y=y + i. So we need to sum up the numbers from 0 to 7.

Step3: Use sum formula

The sum of an arithmetic - series \(S_n=\sum_{k = 0}^{n - 1}k=\frac{n(n - 1)}{2}\), where \(n = 8\) here. Substituting \(n = 8\) into the formula, we get \(S=\frac{7\times(7 + 1)}{2}=\frac{7\times8}{2}=28\).

Answer:

A. 28