If 3 is the first triangular number,which is the tenth one
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Answered by
22
numbers of the form n(n+1)/2, seen in triangular packings
0,1,3,6,10,15,21,28,36,45,55,66....etc
a sequence of triangular numbers
as you said 3 as 1st
i.e. n=2 is first then
n=11 will be 10th
by substituting n=11,
=> 1/2 n(n+1)
=> 1/2 11(12)
=> 11*6
=> 66
If 1st=3, then 10th=66
0,1,3,6,10,15,21,28,36,45,55,66....etc
a sequence of triangular numbers
as you said 3 as 1st
i.e. n=2 is first then
n=11 will be 10th
by substituting n=11,
=> 1/2 n(n+1)
=> 1/2 11(12)
=> 11*6
=> 66
If 1st=3, then 10th=66
Answered by
1
Given : 4 is the first triangular number,
To Find : tenth one
Solution:
1st Number = 3
2nd number = 3 + 4 = 7
3rd number = 3 + 4 + 5 = 12
and so on
10th Number = 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12
= 75
75 is tenth one
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