" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
9 = a + 2b
243 = a + 5b
234 = 3b
b = 78
a = -147
Sn = n/2 (a + Un)
S5 = 5/2 (-147 + -147 + 4(78))
S5 = 5/2 × 18
S5 = 45