51.
What will be the output of the following Python code?
a = ('check',)
n = 2
for i in range(int(n)):
    a = (a,)
    print(a)

55.
Is the following Python code valid?
>>> a,b=1,2,3

57.
What will be the output of the following Python code?
>>> a=(1,2,(4,5))
>>> b=(1,2,(3,4))
>>> a<b

58.
Is the following Python code valid?
>>> a=(1,2,3)
>>> b=a.update(4,)