What is the next triangular number after 15
Answers
Answered by
2
Answer:
21
Step-by-step explanation:
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...
Answered by
3
Answer:
The next triangular number after 15 is 21.
because :-
The first triangle has just one dot.
The second triangle has another row with 2 extra dots, making 1 + 2 = 3.
The third triangle has another row with 3 extra dots, making 1 + 2 + 3 = 6.
The fourth has 1 + 2 + 3 + 4 = 10.
hope it helps you.
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