" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
Sn = (2a+(n-1)b)
= (2(3)+39(4))
= 20 (6+156)
= 20 (162)
= 3240
b=4
Sn=40
Sn = n/2 (2 x a+(n-1)b
S40 = 40/2 (2 x 3 + (40-1) 4
=20 (6+156)
=20 (162)
=3.240