Question

Find 1-2+3-4+5-6............... when last integer is 20?

Answer 1

The answer of your question is - 10
Hope it will help u

Answer 2

Answer:

Step-by-step explanation:

Sum of all odd numbers till 20= 1+3+5....19= 10/2( 2*1+ 9*2)= 5*20= 100

Sum of all even numbers till 20= 2+4+6....20= 10/2( 2*2+ 9*2)= 5*22=110

Their difference= 110-100=10