Math Is Fun Forum

in how many ways a grandfather along with two of his grandsons & 4 grand daughters is seated in line for a photograph, grandfather in middle always and the two grandsons never together

the total number of proper factor of 7875 is

what is the meaning od double derivative

and how can we say that if double derivative is > 0. Then function is Concave up

and if double derivative is < 0. Then function is Concave Down

In a small sweet shop people usually buy either one cake or one box of chocolate ,One day the shop sold 57 cakes and 36 boxes of chocolate,How many customers were there that day if 12 people bought both a cake and a box of chocolate

there are 6 letters and 6 dircted envelopes. then the number of ways in which all leters are put in wrong envelope is

if three dice are rolled once, then the no. of ways of getting at least one prime no. on the dice is

6x + 8y = 48 intersects the coordinate axis at A and B respectively.
a line L bisects the area and the perimeter of the triangle AOB.
where O is the origin. the number of such lines possible is

actually i did not understand meaning of that line

a line L bisects the area and the perimeter of the triangle AOB.