in a row of boys, if a who is 10th from the left and b who is 9th from the right interchange their positions, a becomes 15th from the left. how many boys are there in the row ?
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sheela can choose to go for a party with yogesh, nikhilesh, shashank, amol, shainu, vivek, girish. she has 10 pairs of sandals and 17 different dresses. in how many different ways she will go to the party if she has a choice of taking 5 of her friends. also she likes 7 pair of sandals and 15 dresses which she wants to wear for the party?
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