A card is drawn at random from a well shuffled pack of 52 playing cards. Find the probability that the drawn card is neither a jack nor an ace.

The 24^th term of an AP is twice its 10^th term. Show that its 72^nd term is 4 times its 15^th term.

Find the common difference of the A.P.

For what values of k, the roots of the quadratic equation (k+4)x²+(k+1)x+1 = 0 are equal?

The sum of first n terms of an AP is 3n²+4n. Find the 25^th term of this AP.