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प्रश्न
उत्तर
The given sequence is 11, 8, 5, 2,.... –151.
\[a_n = a + \left( n - 1 \right)d\]
\[ \Rightarrow - 151 = 11 + \left( n - 1 \right)\left( - 3 \right)\]
\[ \Rightarrow - 151 = 11 - 3n + 3\]
\[ \Rightarrow - 151 = 14 - 3n\]
\[ \Rightarrow 3n = 14 + 151\]
\[ \Rightarrow 3n = 165\]
\[ \Rightarrow n = 55\]
Hence, 55th term is number –151.
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