Isodiaphers are the atoms of two elements having same values of:

Q. n-p-n transistors are preferred to p-n-p transistors because they have

Q. Let $P\left(n\right)$ be a statement and $P\left(n\right)=P(n+1)\forall n\in N$, then $P\left(n\right)$ is true for what values of $n$?

Q. Let $F_{pp}$ and $F_{nn}$ denote the net magnitudes of forces between a proton and a proton, a proton and a neutron, and between two neutrons, when they are $1fm$ apart. Which is the correct relation?

Q. For any two sets $A$ and $B$,
$n\left(AUB\right)\ge n\left(A\right)+n\left(B\right)$
where, $n\left(P\right)$ represents the number of elements in set $P$.

Q. What is the possible value of $P$ ?