61. SUM OF NATURAL NUMBERS
 
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Sum of Natural Numbers from 1: SUM
1 1
1 + 2 3
1 + 2 + 3 6
1 + 2 + 3 + 4 10
1 + 2 + 3 + 4 + 5 15
...   ...
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 45
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 55
Can you find any pattern?
  
Write these 'sums' without counting 
1+2+3+4+5+6+7+8+9+10+12???
1+2+3+4+5+...+15???
1+2+3+4+5+...+19???
1+2+3+4+5+...+20???
1+2+3+4+5+...+21???
1+2+3+4+5+...+100???

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