Question

Encircle the correct answer from the given options:
(a) A prime triangular number is
(i) 5
(ii) 3
(iii) II
(iv) 19​

Answer 1

Answer:

3

Step-by-step explanation:

The only number that is triangle and prime is 3. The triangle numbers can be generated from T=2n2±n=n(2n±1) so that when n=1, triangle number 3 is generated, and when n=2, triangle numbers 6 and 10 are generated, etc.

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