Four-digit 67444

Emil forgot the PIN for his payment card. It knows that it is four-digit, starts with 1, ends with 2, and does not repeat digits; its digit sum is 15. How many such codes are there? List all the options.

Correct answer:

n =  7

Step-by-step explanation:

s=1512=12 12= 9+3 = 8+4=7+5=6+6 a1=1932 a2=1392 a3=1842 a4=1482 a5=1752 a6=1572 a7=1662  n=7

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