" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
b= -5
S10= 1/2·10 ( 2×a + n-1 × b)
5 (2× -5 + 9×-5)
5 (-10 + (-35) )
5 × -45
-225