Find the missing number: 2, 6, 12, 20, 30, ?
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Correct answer: (B) 42
Explanation
n(n+1): 1×2, 2×3, 3×4, 4×5, 5×6, 6×7 = 42 (differences 4, 6, 8, 10, 12).
From DSSSB TGT Computer Science Full Mock Test 3
This is question 21 of DSSSB TGT Computer Science Full Mock Test 3. 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.