SSC MTS & Havaldar 2011 · Question 1 of 74
Pattern followed here is (n-1)/2 i.e (85-1)/2 = 42. Similarly, (139-1)/2 = 69. Hence, option B is the correct answer.
Source: Solved SSC MTS 20 February 2011 Shift 1 Paper with Solutions · reliable-secondary
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