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 17769 times.	Basics Training	Start
New	Multiples of 3 and 5 Solved 16217 times.	Basics Training	Start
New	Print every two letters pairs Solved 13217 times.	Basics Training	Start
New	Print every pair of distinct letters Solved 12367 times.	Basics Training	Start
New	Distance Solved 9474 times.	Training	Start
New	Is divisible by ? Solved 4461 times.	Training	Start
New	Check if a number is prime Solved 6904 times.	Training	Start
New	Print every prime numbers in a range Solved 4862 times.	Training	Start
New	Sum of every prime number below n Solved 4955 times.	Training	Start
New	Next prime Solved 3699 times.	Training	Start
New	Display the date and time Solved 5117 times.	Training	Start
New	The Fibonacci sequence Solved 2480 times.	Training	Start
New	Exceptions Solved 2084 times.	Training Command line	Start
New	Flatten lists Solved 1580 times.	Training	Start
New	Print the content of a file Solved 1825 times.	Training	Start
New	Adam Number Solved 930 times.	Training	Start
New	Product of iterable Solved 1897 times.	Training	Start
New	Frequency of letters in a file Solved 1137 times.	Training	Start
New	Pernicious numbers Solved 1100 times.	Training	Start
New	Count the lower 'e' in the 'words' file Solved 1487 times.	Training	Start
New	Largest product in a series Solved 988 times.	Training	Start
New	Doing HTTP requests Solved 964 times.	Training	Start
New	Consecutive Sum Solved 547 times.	Training	Start
New	Longest Collatz sequence Solved 1011 times.	Training	Start
New	Simple adder Solved 1830 times.	Training Command line	Start
New	Lambda expressions Solved 813 times.	Training	Start
New	Largest product in a grid Solved 583 times.	Training	Start
New	Pascal's triangle Solved 428 times.	Training	Start
New	CSV and Python Solved 346 times.	Training	Start