" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
b = 24-27 = -3
Sn = n/2 (2a+(n-1)b)
S20 = 20/2 (2.27+19.(-3))
= 10 (54-57)
= 10. (-3)
= -30