Question 4

Select the correct option that will fill in the blank and complete the series.
21, 43, 85, 171, 341, .......

Solution

Logic of Question is..

21-43 = 22 (previous number 21+1 =22)

43-85 = 42 (previous number 43-1=42)

85-171 = 86 (previous number 85+1 =86)

171-341 = 170 (previous number 171-1=170)

Hence, 341+1=342

342 + 341 = 683

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Select the correct option that will fill in the blank and complete the series.21, 43, 85, 171, 341, .......