Use gauss's approach to find the followinf sums (do not use the formulas)
a. 1+2+3+4++1002
b. 1+3+5+7++99

the sum of the sequence is

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation:

-12 > a

step-by-step explanation:

-11 > 1 + a

subtract 1 from each side

-11-1 > 1-1+a

-12 > a