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how many differnt numbers can be formed by using six out of nine digits 1,2,3....9???

Read Solution (Total 9)

TCS Other Question

In hw many ways can 5 prizes be given away to 4 boys when each boy elgible for al prizes? After typist types 12 letters and adresses 12 envelops , she inserts the letter randomly into envelops.wt is probability tht exactly 1 lettr is inserted in improper envelop??