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u11..a + 10b = 53 -
-6b = -30....b= 5
..... a = 3
u8= a + 7b = 3 + 7*5 = 38
s8 = 1/2 n ( a + u8)
= 1/2 *8 (3+ 38)
= 4 * 41
s8 =164