general Maths Puzzle

The screen display of an electronic lock can be unlocked by touching 7 points in certain sequence without overlap , out of total 9 points, arranged in the rows of 3. In how many ways this unlocking is possible ?

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general Other Question
An item is marked at Rs. 970 cash or for Rs. 210 cash down payment followed by three equal monthly instalments. If the rate of interest charged under the instalment plan is 16% p.a; then what is the monthly instalment? x can do a piece of work in 16 days and y can do it in 24 days.With the help of z entire work was finished in 6 days.What will be the share of x, if the total compensation is Rs 1100 ?