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Study the patterns shown.
In pattern 4, there will be as many white triangles as yellow triangles.
(a) How many triangles will be there in the 89th pattern?
(b) How many white triangles will be there in the 76th pattern?
(c) How many yellow triangles will be there in the 105th pattern?
(d) How man triangles will be there in the 200th pattern?
Notes to students: