Question

Pls provide me all the formulaes in vector alzebra of class 12

Answer 1

ok i tell you 
Let a⃗ ,b⃗  be the position vectors of the points A and B respectively. If the point P divides the  line joining A and B in the ratio m:n internally, then the  position vector of P  is OP→=na⃗ +mb⃗ /m+n
The position vector of the midpoint of  AB=a⃗ +b⃗ /2

Let a⃗ ,b⃗  be the position vectors of the points A and

B respectively. If the point P divides the  line joining A 

and B in the ratio m:n externally, then the  position vector of P is  OP→=na⃗ −mb⃗ /m−n

i know only here because i am 10th standard student 
so please mark as a brain-list .