1: An op amp tries to make the -ve terminal voltage equal to the +ve terminal voltage.
If you tries to analyze the non-inverting amplifier you can see a potential diveder at
the output of the op amp to the ground via the -ve input terminal.
while the op amp try to make the input terminals equiv-potential, the output voltage should
be larger than the input voltage which then will get divided in the potential divider.
so the output voltage is now larger than the input voltage.
then output > input*1.(1 when multiplied with anything remains the same).
so output/input >1.
so the gain will always be greater than 1 for an non-inverting amplifier.