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Verified answer
A) 3,5,7,9,11 ...a = 3
b = 2
Un = a + ( n - 1 ) b
Un = 3 + ( n - 1 ) 2
Un = 3 + 2n - 2
Un = 2n + 1
b) 64,32,16,8,4,....
a = 64
r = 32/64 = 16/32 = ½
Un = ar^n-1
Un = 64 • ( ½ )^n-1