If 4 is the first triangular number, which is the tenth one?
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Answer: 88 will be the tenth number
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Given : 4 is the first triangular number,
To Find : tenth one
Solution:
1st Number = 4
2nd number = 4 + 5 = 9
3rd number = 4 + 5 + 6 = 15
and so on
10th Number = 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13
= 85
85 is tenth one
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