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What is the next number of the following sequence - 17, 27, 44, 64, 108, 138, ?

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posted Jun 15, 2015 by Kapil Kapoor

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3 Solutions

+2 votes
 
Best answer

if we give index number to each of the given number , our series will be :

index no - given no
1 - 17
2 - 27
3 - 44
4 - 64
5 - 108
6 - 138
now , through inspection we can say that difference between number with odd index with even index is multiple of 10 i.e. 27-17 = 10 , 64-44 = 20 , 138-108 = 30
&
difference between number of even index with odd index is previous number stored at odd index i.e.
44-27 = 17 (located at index 1) , 108-64 = 44 (located at index 3) .
hence , next number will be 138 + 108 = 246

solution Jun 15, 2015 by anonymous
+1 vote

increase second number by 10
you will get 17+10=27
17+27=44
44+20=64
44+64=108
108+30=138
108+138=246

Next term is 246

solution Jun 15, 2015 by Jyoti Mhaske
0 votes

17+10=27+17=44+20=64+44=108+30=138+108=246+40=286+246=532+50=582

solution Aug 21, 2015 by Shumaila Ayaz
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