Elements a, b, c and d have the following electronic configuration a.1s2,2s22p1 b. 1s2,2s22p6,3s23p1 c. 1s2,2s22p6,3s23p3 d. 1s2,2s22p6,3s33p5 Among these the elements belong to 13th group in the periodic table are
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