Training

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Those exercises are often focusing on a single aspect of the language:

They should be quick to understand.
But they may not be the kind of problem you'll encounter in real life.

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New	Sum of even numbers <= 100 Solved 17387 times.	Basics Training	Start
New	Multiples of 3 and 5 Solved 15868 times.	Basics Training	Start
New	Print every two letters pairs Solved 12932 times.	Basics Training	Start
New	Print every pair of distinct letters Solved 12099 times.	Basics Training	Start
New	Distance Solved 9247 times.	Training	Start
New	Is divisible by ? Solved 4242 times.	Training	Start
New	Check if a number is prime Solved 6708 times.	Training	Start
New	Print every prime numbers in a range Solved 4724 times.	Training	Start
New	Sum of every prime number below n Solved 4827 times.	Training	Start
New	Next prime Solved 3598 times.	Training	Start
New	Display the date and time Solved 5018 times.	Training	Start
New	The Fibonacci sequence Solved 2423 times.	Training	Start
New	Exceptions Solved 2049 times.	Training Command line	Start
New	Flatten lists Solved 1543 times.	Training	Start
New	Print the content of a file Solved 1793 times.	Training	Start
New	Adam Number Solved 893 times.	Training	Start
New	Product of iterable Solved 1861 times.	Training	Start
New	Frequency of letters in a file Solved 1117 times.	Training	Start
New	Pernicious numbers Solved 1079 times.	Training	Start
New	Count the lower 'e' in the 'words' file Solved 1467 times.	Training	Start
New	Largest product in a series Solved 973 times.	Training	Start
New	Doing HTTP requests Solved 950 times.	Training	Start
New	Consecutive Sum Solved 530 times.	Training	Start
New	Longest Collatz sequence Solved 996 times.	Training	Start
New	Simple adder Solved 1818 times.	Training Command line	Start
New	Lambda expressions Solved 798 times.	Training	Start
New	Largest product in a grid Solved 574 times.	Training	Start
New	Pascal's triangle Solved 422 times.	Training	Start
New	CSV and Python Solved 341 times.	Training	Start