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Per NCERT, to check if a given number 137 is a term of the odd-number sequence (explicit rule uₙ = 2n − 1), we solve which equation?
A137 cannot be checked
Bn = 137
C2n − 1 = 137 → n = 69, so 137 is the 69th term
D137 = 2n + 1 → n = 68
Answer & Solution
Correct answer: C. 2n − 1 = 137 → n = 69, so 137 is the 69th term
Per NCERT §8.2, set uₙ = 137: 2n − 1 = 137, n = 69. So 137 is the 69th odd number.
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