c# 3.0 - i want c# programme to do this operation -

  IF 7 - 3 = 124 6 + 3 = 279 5 - 2 = 63 11 + 2 = 2613 फिर, 15 - 3 =?  

15 - 3 = आपको ऐसा करके नौकरी नहीं मिल रही है ।