" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
9 93
13 73
24 18
Sn= n/2(a+Un)
Sn= 24/2(133+18)
Sn=12 x 151
Sn= 1812
u13 = a + (13-1)b
a + 8b = 93
a + 12b = 73 -
-4b = 20
b = -5
a + 8.-5 = 93
a = 93 - ( - 40)
= 133
S24= N÷2(2A + (N-1)b
=24/2(2×133 + 23×(-5)
= 12 (266-115)
= 12(151)
=1812
cmiiw