the number of triangles whose vertices are at the vertices of an octagon but none of the sides of such triangle are taken from the side of the octagon?

please provide step by step soln. thanx

total no of triangles-(triangles with 1 side common +triangles with 2 sides common) nw total triangles will be 8c3=56 ans. 56-(32+8 )=16

Originally Posted by jeet_mba some one cud plz explain the best and shortest possible method to solve the below two questions:

1)There are ceratin no of pages in a book.'A' tore a certain page out of the book and later found the average of remaining pages no as 46 10/13.What where the pages missing?

2)There are certain consecutive natural nos,written on black board.one of them is erased and avg of remaining nos is 32 7/24.Whay is the missing no?

Some amount out of 6000 was lent out @ 10% p.a and the rest @ 20 p.a and thus in 4 yrs the total interest collected was 3400. whats the amt lent out at 10% p.a?

Q. If a 100 m wire is made available to fence 3 sides of a rectangular field, with the fourth side as a wall, what can be the maximum area of the field?

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