Question

Given L=[10,20,30,40,50,60,70,80,90,100], how will you get a list [20, 40, 60, 80]

Answer 1

Python programming:

L=[10,20,30,40,50,60,70,80,90,100]

print(L[1:8:2])

Answer 2

Solution:

Assuming that the language is Python, we can solve this question in 2 ways.

Approach 1.

L=[10,20,30,40,50,60,70,80,90,100]

print(L[1::2])

> [20, 40, 60, 80, 100]

Here, the required numbers are present in indexes 1, 3, 5, 7, 9. So, start value = 1, end value = 9 (optional) and step value is 2.

Using list slicing, we have extracted the numbers by writing - L[1 : : 2]

Approach 2.

L=[10,20,30,40,50,60,70,80,90,100]

print(list(filter(lambda x:x%20==0,L)))

> [20, 40, 60, 80, 100]

Here, we can observe that the numbers which are multiple of 20 are taken out. So, using filter() method, we have filtered out by giving a condition that - the number must be divisible by 20.

See the attachment for verification.