1
GATE CSE 2005
+1
-0.3
The set $$\left\{ {1,\,\,2,\,\,4,\,\,7,\,\,8,\,\,11,\,\,13,\,\,14} \right\}$$ is a group under multiplication modulo $$15$$. The inverse of $$4$$ and $$7$$ are respectively:
A
$$3$$ and $$13$$
B
$$2$$ and $$11$$
C
$$4$$ and $$13$$
D
$$8$$ and $$14$$
2
GATE CSE 2005
+1
-0.3
Let $$f$$ be a function from a set $$A$$ to a set $$B$$, $$g$$ a function from $$B$$ to $$C$$, and $$h$$ a function from $$A$$ to $$C$$, such that $$h\left( a \right) = g\left( {f\left( a \right)} \right)$$ for all $$a \in A$$. Which of the following statements is always true for all such functions $$f$$ and $$g$$?
A
$$g$$ is onto $$\Rightarrow$$ $$h$$ is onto
B
$$h$$ is onto $$\Rightarrow$$$$f$$ is onto
C
$$h$$ is onto $$\Rightarrow$$ $$g$$ is onto
D
$$h$$ is onto $$\Rightarrow$$ $$f$$ and $$g$$ are onto
3
GATE CSE 2005
+1
-0.3
The following is the Hasse diagram of the poset $$\left[ {\left\{ {a,b,c,d,e} \right\}, \prec } \right]$$

The poset is:

A
not a lattice
B
a lattice but not a distributive lattice
C
a distributive lattice but not a Boolean algebra
D
a Boolean algebra
4
GATE CSE 2004
+1
-0.3
The number of different $$n$$ $$x$$ $$n$$ symmetric matrices with each elements being either $$0$$ or $$1$$ is (Note: power ($$2,$$ $$x$$) is same as $${2^x}$$)
A
power $$(2, n)$$
B
power $$\left( {2,\,{n^2}} \right)$$
C
$$\left( {2,\left( {{n^2} + n} \right)/2} \right)$$
D
power $$\left( {2,\left( {{n^2} - n} \right)/2} \right)$$
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