M4maths Previous Puzzles

27 Aug 2012 sequence

k,4,n,40,121,364 is a sequence.Then k+n will be

OPtion

1) 20
2) 19
3) 18
4) 15
5) 14
6) 12
7) 11
8) 10
9) 9
10) none of these

Solution

k,4,n,40,121,364
364-121 = 243 = 3^5
121-40 = 81 = 3^4
so
40-n will be 27 = 3^3
so n = 13
and 13-4 = 9 = 3^2
so 4-k will be 3 = 3^1
so k = 1
so k+n = 14

Correct Option: 5 Best Solution (0)