Question
यदि ${a_1} = {a_2} = 2,\;{a_n} = {a_{n - 1}} - 1\;(n > 2)$, तब ${a_5}$ है
${a_4} = {a_3} - 1 = 1 - 1 = 0$
${a_5} = {a_4} - 1 = 0 - 1 = - 1.$
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