Answered

IDNStudy.com, ang iyong platform para sa mga sagot ng eksperto. Ang aming komunidad ay nagbibigay ng eksaktong sagot upang matulungan kang maunawaan at malutas ang anumang problema.

find the sum : 1+2+3+...+9999+10000


Sagot :

we can assure that there are 10,000 terms by just looking at this. then, use the formula of sum of arithmetic sequence which is S=n/2(first term + last term)
S= 10,000/2(1+10,000)
S=5,000(10,001)
so, S=50,005,000