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Earn +20 ptsQ: Is 121 a triangular number
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What is the formula for triangular numbers?
The Nth triangular number is calculated by: N(N + 1) -------- 2 Hope this is useful!
121 prime or composite?
The number 121 is a composite number, since it is divisible by 11.
What solid figure has the least number of faces a triangular prism or triangular pyramid?
triangular pyramid
Why is 121 not prime?
121 is not a prime number. It is divisible by 11.
The 8th triangular number is 36 what is the 7th triangular number?
The formula for the nth triangular number is n(n+1)/2. If the 8th triangular number is 36, then we can set up the equation 8(8+1)/2 = 36. Solving for n, we get n = 7. Therefore, the 7th triangular number is 7(7+1)/2 = 28.
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