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vishalwahee@gmail.com from Bhatnagar International Summit, New Delhi

Subject :IMO Class : Class 5

What is the number in the START box? 
 

A 202.5
B 640
C 1120
D 207360 

can u please tell the explanation of this question

Ans 1:

Krishiv Goyal from Ridge Valley School, Gurgaon

Class : Class 6

640 you idiot