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Mario’s aim is to apply this flickable s...

Mario’s aim is to apply this flickable staff several times to toggle the state of a single door. What are the possible number of times Mario would have to use this staff to achieve his aim?

A

25

B

32

C

40

D

49

Text Solution

Verified by Experts

Toggle all the doors except 5th, 10th, 15th, 20th, 25th, 30th, 35th, 40th, 45th, 49th 
This way, Only Door 1 will be opened and all others closed. 
That means minimum steps required are 39 ….. So any odd number equal to or greater  than 39 is the possible steps 
So 49 steps is the answer
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