Find the missing number: 3, 7, 15, 31, 63, ?
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Correct answer: (C) 127
Explanation
Each term = previous × 2 + 1 → 63 × 2 + 1 = 127.
From DSSSB TGT Computer Science Full Mock Test 2
This is question 21 of DSSSB TGT Computer Science Full Mock Test 2. See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.