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Find the number of triangles in the given figures.

(a) 60 

(b) 65 

(c) 84 

(d) 90

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Correct option is : (a) 60

Number of rows = 4

Sum of numbers in each row = 1 + 2 + 3 + 4 + 5 = 15 

Number of triangles in the picture = 4 × 15 = 60

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