If after 7th step number of cubes painted in exactly 2 faces with colo – McqOptions

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1.	If after 7th step number of cubes painted in exactly 2 faces with colour 7 is 21, then what is the number of cubes removed in 3rd step.
A.	469
B.	455
C.	433
D.	None of these
Answer» B. 455

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