5. What is the sum of the prime numbers from 1 to 20?
(1) 79 (2) 78 (3) 77 (4) 76
3
6. How many composite numbers are there from
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5. 77
6. There are 34 composite numbers between 1 to 50 which are as follows: 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, 50.
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