How many composite numbers are between 1 and 50?

Question

dimljenihhml · Accepted Answer

Step 1Composite numbers are those which have 3 or more factors:Prime numbers are those which have exactly 2 factors:There are more composite numbers than &#039; numbers, (can you explain why this is so?)So it will be easier to count the &#039; numbers and subtract them.There are 50 numbers from 1 to 50Therefore there are 48 numbers between 1 and 50, which are excluded.There are 15 &#039; numbers less than 50, which are:2, 3, 5, 7, 11, 17, 19, 23, 29, 31, 37, 41, 43, 47Therefore there are48−15=33 composite numbers between 1 and 50.

iluvyou23452nwj · Accepted Answer

Step 1
Between 1 and 50, we have following numbers as composite.

{4, 6, 8 . 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30, 32, 33, 34, 35, 36, 38, 39, 40, 42, 44, 45, 46, 48, 49}

Total 33 composite numbers.

How many composite numbers are between 1 and 50?

Answered question

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