1
GATE CSE 2016 Set 1
MCQ (Single Correct Answer)
+1
-0.3
Let $${a_n}$$ be the number of $$n$$-bit strings that do NOT contain two consecutive $$1s.$$ Which one of the following is the recurrence relation for $${a_n}$$?
A
$${a_n} = {a_{n - 1}} + 2{a_{n - 2}}$$
B
$${a_n} = {a_{n - 1}} + {a_{n - 2}}$$
C
$${a_n} = 2{a_{n - 1}} + {a_{n - 2}}$$
D
$${a_n} = 2{a_{n - 1}} + 2{a_{n - 2}}$$
2
GATE CSE 2016 Set 1
Numerical
+2
-0
The coefficient of $${x^{12}}$$ in $${\left( {{x^3} + {x^4} + {x^5} + {x^6} + ...} \right)^3}\,\,\,\,\,\,$$ is _____________.
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3
GATE CSE 2016 Set 1
Numerical
+2
-0
A function $$f:\,\,{N^ + } \to {N^ + },$$ defined on the set of positive integers $${N^ + },$$ satisfies the following properties: $$$\eqalign{ & f\left( n \right) = f\left( {n/2} \right)\,\,\,\,if\,\,\,\,n\,\,\,\,is\,\,\,\,even \cr & f\left( n \right) = f\left( {n + 5} \right)\,\,\,\,if\,\,\,\,n\,\,\,\,is\,\,\,\,odd \cr} $$$

Let $$R = \left\{ i \right.|\exists j:f\left( j \right) = \left. i \right\}$$ be the set of distinct values that $$f$$ takes. The maximum possible size of $$R$$ is _____________________.

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4
GATE CSE 2016 Set 1
Numerical
+2
-0
Consider the recurrence relation $${a_1} = 8,\,{a_n} = 6{n^2} + 2n + {a_{n - 1}}.$$ Let $${a_{99}} = K \times {10^4}.$$ The value of $$K$$ is ____________.
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