Oh, dude, you're really testing my math skills here! So, 1 plus 2 is 3, plus 3 is 6, plus 4 is 10. Like, easy peasy lemon squeezy.
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1+2+3+4=10
The formula for adding consecutive numbers is n*(n+1)/2. This could be done easily as mental math, on paper or using a calculator.
It is 77
43
assuming question is 1 and 3/4 plus 2 and 3/4 1 + 2 = 3 3/4 + 3/4 = 6/4 = 3/2 = 1 and 1/2 total = 4 and 1/2
30. 2+3+5=10, 4+6=10, and 2+4+1+1+2=10.
23