Question

1+2+3+4+5+6+7+8
without calculation find and tell the reason?

Answer 1

heya ✋

here's ur answer dear :-

Indeed the fastest one is the formulae "Sum of natural numbers".


Since your sequence is a set of natural numbers it can be calculated as :

$s = \frac{n(n + 1)}{2}$



Where n is the no. of terms 
S = 8(8+1)/2
S = 36
So, the sum is 36

_________ __________ __________

hope it helps
#thankyou

Answer 2

that's 36
1 + 2 + 3 + 4 = 10
10 + 5 + 6 =21
21 + 7 + 8 = 36
hope its helpful