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U1= a = 4
U2= 7
U3= 10
U4= 13
b= U2 – U1 = U3 – U2 = U4 – U3
= 7 – 4 = 10 – 7 = 13 – 10
= 3 = 3 = 3
Un =a+(n-1) b
U7 = a+(n-1) b
=4+ (7-1) 3
=4+21 - 3
=25 - 3
= 22
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