4 persons a, b, c, d are to be lined up in a row. If a, b, and c adhere always together, how many possible cases are there?
Choose the correct choice from the following options
A) 12 B) 36 C) 48 D) 72 E) 144
firstly it is not GEOMETRY but COMBINATIONS, so changing the TAG accordingly..   total 4 are there..   take a,b, and c as one,so total =2..   these 2 can be arranged in 2! ways..   a,b, and c can be arranged within themselves in 3! ways ..   TOT12L = 2!*3!=12   12
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4 persons a, b, c, d are to be lined up in a row. If a, b, and c adhere always together, how many possible cases are there?