1, 3, 8, 19, 42?

Choose the correct alternative from the given ones that will complete the series.
1, 3, 8, 19, 42?
(a) 89
(b) 84
(c) 82
(d) 70

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1 Answer(s)

Answer: (a) 89 

Explanation:-
1 x 2 + 1 = 2 + 1
 = 3, 
3 x 2 + 2 = 6 + 2
 = 8, 
8 x 2 + 3 = 16 + 3
 = 19, 
19 x 2 + 4 = 38 + 4
 = 42. 

Same as, 
42 x 2 + 5 = 84 + 5
 = 89 

Then, the next term will be 89. 

Hence, the correct answer is option (a) 89. 

Anurag Mishra Professor Answered on 4th May 2016.
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