Saved Bookmarks
| 1. |
subtract the sum of all prime numbers between 10 and 20 from the sum of all composite numbers between 10 and 20? |
|
Answer» of all the prime NUMBERS between 10 and 20 is 60. This dum is divisible by the single digits 1, 2, 3, 4, 5 and 6.Sum of all = n(n+1)/2 = 20 X 21 /2 =210; Deduct Sum of 1 2 3 5 7 11 13 17 19 = 78 |
|