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The series is multiples of 8.
The next number is 40
Alphabets along with the number on which they come.
A1; B2; C3; D4; E5; F6....
The series is coming by multiplying the previous number with 3.
The next digit will be 81*3 = 243
Increasing the series. The next answer will be A.
1 to 4 = 3
4 to 9 = 5
9 to 16 = 7
16 to 25 = 9
25 to 36 = 11
The sequence is,
1^{3}=1
2^{3}=8
3^{3}=27
4^{3}=64
5^{3}=125
6^{3}=216
List Of Triangular Numbers. 0, 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, 91, 105, 120,136, 153, 171, 190, 210, 231, 253, 276, 300, 325, 351, 378, 406, 435, 465, 496, 528, 561, 595, 630, 666, 703, 741, 780, 820, 861, 903, 946, 990, 1035, 1081, 1128, 1176, 1225, 1275, 1326, 1378, 1431, and so on.
1+3+5 = 9
9 = 3^{2}
Therefore, it is a square number
Your sequence is 1, 3, 6, 10, ... and the differences are 2, 3, 4, ... so actually each term is the sum of all the counting numbers up to the term number. So the fifth term in the sequence would be the sum of all the numbers up to 5: 1+2+3+4+5 = 15.
List Of Triangular Numbers. 0, 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, 91, 105, 120,136, 153, 171, 190, 210, 231, 253, 276, 300, 325, 351, 378, 406, 435, 465, 496, 528, 561, 595, 630, 666, 703, 741, 780, 820, 861, 903, 946, 990, 1035, 1081, 1128, 1176, 1225, 1275, 1326, 1378, 1431, and so on.
Thus, 5 is not a triangular number
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