2. In a class of 25 girls and 20 boys, a boy and a girl are to be chosen for debate competition. In how many ways can the selection be made? ​

Is δ pmr similar to δ smn ? if so, which postulate or theorem proves these two triangles are similar?

(a) (8%) compute the probability of an even integer among the 100 integers 1! , 2! , 3! , until 100! (here n! is n factorial or n*(n-1)*(n-2) *… 1) (b) (16%) compute the probability of an even integer among the 100 integers: 1, 1+2, 1+2+3, 1+2+3+4, …., 1+2+3+… + 99, and 1+2+3+… + 100

Ten times the square of a non-zero number is eqaul to ninety times the number