Getting Ready for the Next Section
133. 4, 4, 4, 4
135. −5,−5,−5,−5
137. a2=7, a3=11, a4=15, a5=19
139. a2=4, a3=1, a4=−2, a5=−5
141. 3, 3, 3, 3
143. −2,−2,−2,−2
145. an+1=2n−3, an−1=2n−7
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