1.

Let f(n) denotes the number of different ways in which the positive integer n can be expressed as the sum of 1′s and 2′s. For example f(4)=5, since4=2+2=2+1+1=1+2+1=1+1+2=1+1+1+1.Then which of the following(s) is (are) CORRECT ?

Answer»

Let f(n) denotes the number of different ways in which the positive integer n can be expressed as the sum of 1s and 2s. For example f(4)=5, since

4=2+2=2+1+1=1+2+1=1+1+2=1+1+1+1.



Then which of the following(s) is (are) CORRECT ?



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