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Tanav Mittal from G D Goenka Public School dwarka, Delhi

Subject :IMO Class : Class 3

What is the missing number in the box?

A 729
B 689
C 525
D 625

Ans 1:

Prisha Badwe from Campus School IIT Kanpur, Kanpur

Nehal from New Horizon Gurukul, Bangalore

Pranaya Chaudhary from Springdales School Dubai , Dubai

Do everthing the opposite like when they said plus do minus

Abhiraj shukla from DPS banglore east, BENGALURU

plz explain the how to solve this