" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
b=3
n=25
Sn = n/2(2a+(n-1)b)
S25 = 25/2 (2×4+(25-1)3)
S25 = 25/2 (8+(24×3)
S25 = 25/2 (8+72)
S25 = 25/2 × 80
S25 = 25 x 40
S25 = 1000