" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
b=-3
S20=20/2(2(27)+(20-1)-3)
10(54-57)
10(-3)
-30
a=27
b=-3
s20=1/2.20(2.27+(20-1)-3)
=-30