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=35/7 = 5
u20 =a+(n-i)b
=42+(20-1)5
=42+(19)5
=42+95
=137
14 = 77
b = (77-42) : (14-7)
= 35:7
= 5
u1 = 12
u 20 = a + (n -1) b
= 12 + 19 . 5
= 12 + 95
= 107