CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon


Question

The value of 1 - 2 + 3 - 4 + 5 - 6 +........... + 19 - 20 is __________.



A

20

loader
B

-20

loader
C

-10

loader
D

10

loader

Solution

The correct option is C

-10


Here, 
 (12)=(21)=1 
 (34)=(43)=1
   .
   .   
 (1920)=(2019)=1

There are 10 pairs having a value -1.

12+34+56 +...........+1920
= +10×(1)= 10  [x×(y)=xy]


Mathematics

Suggest Corrections
thumbs-up
 
0


similar_icon
Similar questions
View More


similar_icon
People also searched for
View More



footer-image