If in each number, all the composite digits are changed to their just – McqOptions

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1.	If in each number, all the composite digits are changed to their just previous prime number and all the prime digits are changed to their just next composite number then how many times '7' is repeated in the new sequence?
A.	6
B.	5
C.	4
D.	7
E.	None of these
Answer» B. 5

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