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Subject :IMO    Class : Class 6

How many 6 are there in the following number series, each of which is immediately preceded by 1 or 5 and immediately followed by 3 or 9?
2 6 3 7 5 6 4 2 9 6 1 3 4 1 6 3 9 1 5 6 9 2 3 1 6 5 4 3 2 1 9 6 7 1 6 3

ANone
BOne
CTwo
DThree


Ans 1:

Class : Class 5
The ans is d

Ans 2:

Class : Class 6

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