ans for 2)

        well prob=no.of fav. outcomes

                       ttl no. of outcomes

                ttl no. of outcomes=⁵²C₂

no.of fav outcomes = (¹³C₁x⁴C₁) - (13)

 

the sub of 13 is because if d 1st one is an ace in spade the other one can be an ace only 4m diamond,heart and clover

th 13 =¹³C₁ x ¹C₁