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Ans 7:
Class : Class 7
a triangle triangle triangle= 15, triangle triangle star= 13 , triangle triangle=10 as 1 triangle= 5, star = 3 , star triangle = 8 , 12-- 8 = 4, square = 4 , now star square -- triangle, means 3 4 -- 5 , 3 4= 7 ,7 -- 5 = 2 answer is a - 2