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lalu S26 = 26/2(2.14 + 25.2) = 13.78 = 1014
U7 = a + ( 7-1 ) * b <=> a + 6b = 26
------------------ -
-4b = -8
b = 2
a + 2*3 = 18 <=> a = 12
S26 = 26/2 x { 2*12 + (26-1)*2}
= 13 x 74
= 962