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b=8/4=2
U1=18-4=12
U26=18+23x2=18+46=64
S26=13 (12+64)
=13 x 76 = 888 (d)
6b - 2b= 4b
26- 18 = 8
4b = 8
b= 2
a + 12 = 26
a = 14
s26 = n/2( 2a + (n-1)b = 26/2( 2.14 + (26-1)2
= 13 ( 28 + 50)
= 13(78 )= 1014 (B)