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Question Number 195208 by Mastermind last updated on 27/Jul/23

Answered by BaliramKumar last updated on 27/Jul/23

$$3\left[\frac{3(3+1)}{2}\right]=18$$

Commented by BaliramKumar last updated on 27/Jul/23

Answered by mr W last updated on 27/Jul/23

$$3\times C_2^4=3\times 6=18$$

Commented by mr W last updated on 27/Jul/23

Commented by mr W last updated on 27/Jul/23

$$generally:$$$$numberoftriangles=m\times C_2^n=\frac{mn(n-1)}{2}$$

Answered by York12 last updated on 27/Jul/23

$$(1+2+3)\times 3=18$$

Answered by jaoa_ao1 last updated on 27/Jul/23

$$\mathrm{zjzjmsms}$$

Commented by York12 last updated on 27/Jul/23

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