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7. Goti has some friends, out of whom, he can invite 4 persons in exactly 70 numbers of ways (that is the maximum possible options that he can have in all his friends). Ram has just one less number of friends, he has half the total options that Goti has for inviting maximum number of friends. How many friends does Ram has? .
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9. There are 15 seats (from 1 to 15). Seat no. 6 is already occupied. In how many ways can be give 3 seats out of these seats to people in such a way that no two consecutive seats are occupied?
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12. A retailer buys a sewing machine at a discount of 15% and sells it for Rs. 1955. Thus, he makes a profit of 15%. The discount is: (a) Rs. 270 (b) Rs. 290 (c) Rs. 300 (d) Rs. 280