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15+(15-1)-2
15+-28
=-13
U7 = 3
U4 = a + 3b = 9
U7 = a + 6b = 3 -
-3b = 6
b = 6 / -3
b = -2
a + 3b = 9
a + 3(-2) = 9
a + (-6) = 9
a - 6 = 9
a = 9 + 6
a = 15
U15 = a + (n- 1) b
= 15 + (15 -1 ) -2
= 15 + (14) -2
= 15 + (-28)
= 15 - 28
= -13