1.

Find the number of triangles in the following figure.(1) 16 (2) 32 (3) 40 (4) 80

Answer»

(3) 40

 5C2 x 1C1

⇒ \(\frac{5\times4}{2\times1}\times1\)

⇒ 10 from one triangle

So, 10 x 4 = 40



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