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Q.

If $A=\{-1,0,2,5,6,11\},B=\{-2,-1,0,18,28,108\}$ and $f\left(x\right)=x^2-x-2,$ find $f\left(A\right).$ Is $f\left(A\right)=B?$

Q.

What is the product of two functions?

Q. If a function is defined from $A$ to $B$ as


then the image of $1$ is

Q.

Evaluate $\frac{n!}{(n-r)!}$ when

$\left(i\right)n=6,r=2\left(ii\right)n=9,r=5.$

Q. If a function is defined from $A$ to $B$ as


then the number of preimages of $3$ is

Q. If $f:N\to R$ is a function defined as $f\left(x\right)=2x^2+1$, then the image of $5$ under $f$ is

Q. If $f:N\to R$ is a function defined as $f\left(x\right)=2x^2+1$, then the preimage of $9$ is