In an AP,the sum of first n term is 3n2/2+13n/2
find its 25th term
n =1
S1 = 3/2+13/2 = 16/2 =8
S2 = 12/2 + 26/2 = 6+13 = 19
S2 -S1= 19-8 = 11=a2
a2-a1 =d
d= 11 -8 = 3
a25 = a+(25-1)d
= 8 + (24 x3)
= 72+8 =80
In an AP,the sum of first n term is 3n2/2+13n/2
find its 25th term
n =1
S1 = 3/2+13/2 = 16/2 =8
S2 = 12/2 + 26/2 = 6+13 = 19
S2 -S1= 19-8 = 11=a2
a2-a1 =d
d= 11 -8 = 3
a25 = a+(25-1)d
= 8 + (24 x3)
= 72+8 =80