SSC JE Mechanical Engineering 2018 Set 2 Paper

Question : 27 of 200

Marks: +1, -0

In the following question, select the missing number from the given series.
21, 22, 34.5, 71, 180, 543, ?

Solution:

21 ↔ 21 + 1 = 22

22 ↔ 22×3/2+ 1 .5= 34.5

34.5↔ 33×4/2+1.5+0.5=71

71↔ 71×5/2+1.5+0.5

+0.5=180

180↔ 180×6/2+1.5+0.5

+0.5+0.5=543

543↔ 543×7/2+0.5+0.5

+0.5+0.5=1904

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