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what is the sum of all the 4 digit numbers that can be formed using all of the digits 2,3,5 and 7?

Read Solution (Total 8)

TCS Other Question

each of two friends has 20 stamps and 10 post cards.we call an exchange 'fair' if they exchange a stamp for a stamp or postcard for a post card.how many ways are there to carry out one fair exchange between these two friends? in how many ways can one or more of 6 similar perk choclates and 5 similar kitkat choclates be given away?