Question

1+2+3...........+10=?​

Answer 1

Step-by-step explanation:

consider this to be an arithmetic progression .

first term=1

difference=1

n=10

sum =n/2(2a+(n-1)d)

sum=10/2(2+(9)1)

=5(11)

sum = 55.

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Answer 2

Use the formula n(n+1)/2

Put n=10

Answer = 10*11/2 = 5*11 = 55