tinifazlen
New member
- Joined
- Jul 30, 2013
- Messages
- 1
1. find the sum of all integers between 200 and 400 which are multiples of 3 but not 5.
2.if the sum of the first 4 terms of an AP is x ,the sum of the first 8 terms is y and the sum of the first 12 terms is z,show that 3x+z=3y.
3.if lgx,lg(x+2) and lg (x+16) are three consecutive terms of an AP. find the value of x.
4.find the sum of the series 20^2-19^2+18^2-17^2+16^2-15^2 +...+2^2-1^2 :shock:
2.if the sum of the first 4 terms of an AP is x ,the sum of the first 8 terms is y and the sum of the first 12 terms is z,show that 3x+z=3y.
3.if lgx,lg(x+2) and lg (x+16) are three consecutive terms of an AP. find the value of x.
4.find the sum of the series 20^2-19^2+18^2-17^2+16^2-15^2 +...+2^2-1^2 :shock: