y the output for the third one is {a+25}{a+25}? y not 5050

Question

a=25
print(a+25)
print("{a+25}"*2)

Answer 1

(python)

when you multiply a String in python python just extends the String as many times with it's self.

Answer 2

if you write:
a = 25
print(str(a+25)*2)
then the output will be "5050"

Answer 3

You might be searching for the format method.
"{a+25}".format(...)