Efficiency of algorithms

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Question 3

Easy

Two different algorithms are written to calculate the sum of the first $n\,$ positive even integers.

Algorithm A

n = int(input("Enter n: "))
total = 0
for i in range(1, n + 1):
    total = total + (2 * i)
print(total)

Algorithm B

n = int(input("Enter n: "))
total = n * (n + 1)
print(total)

Algorithm B is more efficient than Algorithm A.

Justify this statement.

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