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u7 = a + 6b = 16
6b =16 - 4
6b = 12
b = 2
s10 = 1/2n (2a +( n-1) b)
= 1/2 * 10 ( 2*4 + (10-1)2
= 5 (8 + (9)2
= 5 ( 8 + 18)
= 5 (26)
s10 = 130