Others Maths Puzzle

28c2r : 24c(2r-1) = 225:11 find r ?

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Others Other Question

Three boys Ali, Bashar and Chirag are sitting around a round table in that order. Ali has a ball in his hand. Starting from Ali the boy having the ball passes it to either of the two boys. After 6 passes the ball goes back to Ali. How many different ways can the ball be passed? Using digits 2,3,4,5,6 only. find sum of all 5 digits numbers that can be formed such that no 2 digits are the same.