1)

N = 8

array = [random.randint(0,10) for i in range(N)]

print(array)

array = [i * i for i in array]

print(array)

2)

N = 10

array = [random.randint(100,300) for i in range(N)]

print(array)

array = [i//10%10 for i in array]

print(array)

3)

N = 10

sum = 0

arr_sum = []

array = [str(random.randint(100,500)) for i in range(N)]

print(array)

for j in array:

   for i in j:

       sum += int(i)

   arr_sum.append(sum)

   sum = 0

print(arr_sum)