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1. 10.5,2 1/2
a=10
b = 2
u12 = a+(n-1)b
=10+11 x 2
=32
s11= n/2 (2a+(n-1)b)
= 11/2 (20+10 x 2)
= 11/2 x 40 = 220
2. 1+1/4+1/16+.....
a=1
b= 4
u10= a+(n-1)b
= 1+9 x 4
=37
s12 = n/2(2a+(n-1)b)
= 12/2(2+11 x 4)
=6(46)=276
a=10
b = 2
u12 = a+(n-1)b
=10+11 x 2
=32
s11= n/2 (2a+(n-1)b)
= 11/2 (20+10 x 2)
= 11/2 x 40 = 220
2. 1+1/4+1/16+.....
a=1
b= 4
u10= a+(n-1)b
= 1+9 x 4
=37
s12 = n/2(2a+(n-1)b)
= 12/2(2+11 x 4)
=6(46)=276