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Maths Puzzle
Numerical Ability
Q. What will be the next number?
1,6,21,52,105,186,...
Read Solution (Total 3)
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- Look upon the series carefully;
1,6,21,52,105,186,...
6 - 1 = 5
21 - 6 = 15
52 - 21 = 31
105- 52 = 53
186- 105= 81
5 , 15 , 31 , 53 ,81
15 - 5 = 10
31 -15 = 16
53 -31 = 22
81 -53 = 28
10 , 16 ,22 ,28
each no. has the difference of 6
so the next number of this series will be
28 + 6 = 34
34 + 81 = 115
add this with last no.
186 + 115 = 301
so next no will 301
- 10 years agoHelpfull: Yes(5) No(1)
- 1,6,21,52,105,186,301
a(n) = n^3 - n^2 + n
a(1)=1-1+1=1
a(2)= 8-4+2=6
a(3)= 27-9+3=21
..
..
a(7)= 7^3-7^2+7= 7(7^2-7+1)=7*43= 301 - 10 years agoHelpfull: Yes(4) No(0)
- i dont know
- 4 years agoHelpfull: Yes(0) No(1)
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