" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
b = 7-12 = -5
Un = a + (n-1)*b
Un = 12 + (n-1)*(-5)
Un = 12 + (-5n) + 5
Un = 17 - 5n
Un= -5n +17