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$1\mathrm{.}7$ The LTE air interface is identified as the E$-$UTRA $($Evolved $-$ Universal Terrestrial Radio Access$)$ and can support bandwidth options from $1\mathrm{.}4MHz$ to $20MHz.$ Determine the number of Physical Resource Blocks $($PRBs$)$ if the evolved Node B $($eNB$)$ is configured for a channel bandwidth of

$1\mathrm{.}7\mathrm{.}11\mathrm{.}4MHz.$

$1\mathrm{.}7\mathrm{.}25\mathrm{.}0MHz.$

$1\mathrm{.}7\mathrm{.}320MHz.$

Figure $1$: LTE air interface. U: 'User to network'; u: 'universal'