Which of the following number is not a triangular number *
3
6
10
9
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Answered by
1
Answer:
10 is not a triangular number . because 3 , 3+3= 6 , 3+3+3=9. thus 3,6,9 are triangular numbers
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0
for example if the digital root of 12 which is not a triangular number is 3 and divide by 3 is so answers is 3
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