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1. Using a for loop:

for i in range(5):
    print('*'*(i+1))

Output:

*
**
***
****
*****

1. Using a while loop:

i = 1
while i <= 5:
    print('*'*i)
    i += 1

Output:

*
**
***
****
*****

1. Using nested loops:

for i in range(5):
    for j in range(i+1):
        print('*', end='')
    print()

Output:

*
**
***
****
*****