Answer:
Given, A.P. is 5, 9, 13,......, 185 \[l~=185\] and \[d=5-9=9-13=-4\] then, \[{{l}_{9}}=l+(n-1)d\] \[=185+(9-1)(-4)\] \[=185+8(-4)\] \[\therefore {{l}_{9}}=153\]
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