If 1 is subtracted from the last digit of each of the given numbers, then the sum of the digits of how many of them are prime numbers? (SOF IMO 2016) 972 526 487 359 251

If 1 is subtracted from the last digit of each of the given numbers, t

1.	If 1 is subtracted from the last digit of each of the given numbers, then the sum of the digits of how many of them are prime numbers? (SOF IMO 2016) 972 526 487 359 251
A.	None
B.	Two
C.	One
D.	Three
Answer» C. One

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If 1 is subtracted from the last digit of each of the given numbers, then the sum of the digits of how many of them are prime numbers? (SOF IMO 2016) 972 526 487 359 251

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