how to find 20th and 120th triangular number please help whoever does it i will give them brainliest
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how to find 20th and 120th triangular number please help whoever does it i will give them brainliest
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Answer:
is simply the number of dots in each triangular pattern:
triangular numbers
By adding another row of dots and counting all the dots we can
find the next number of the sequence.
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
etc!