Paper 6 October/November 2008 MATHEMATICH (9709/6) A Levels
لطفا برای اطمینان از عملکرد و تجربه بهتر از مرورگرهای مدرن و به روز مانند کروم یا فایرفاکس استفاده کنید.

Twelve coins are tossed and placed in a line. Each coin can show either a head or a tail.
a) Find the number of different arrangements of heads and tails which can be obtained.
b) Find the number of different arrangements which contain 7 heads and 5 tails.