Question

19. By using dot (.) patterns, which of the following numbers can be arranged in all the three ways namely a line, a triangle and a rectangle?
(A) 9 (B) 10 (C) 11 (D) 12
please give a step by step explanation and do not give any answers if you don't know the answer of my question and also please don't any app link or a youtube video link or else I will report the answer

Answer 1

the correct option is (D) 12

number of dots needed for line=2

number of dots needed for a triangle= 3

number of dots needed for a rectangle=4

now taking lcm of 2,3 and 4.

lcm of 2,3,4=12

therefore the answer is 12.