The sum of 5 numbers in AP is 30 and sum of their squares is 220. Which of the fHome | Discussion Forum
The sum of 5 numbers in AP is 30 and sum of their squares is 220. Which of the following is the third term ?
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1) 25 trees are planted in a straight line 5 metres apart from each other. To water them the gardener must bring water for each tree separately from a well 10 metres from the first tree in line with the trees. How far will he move in order to water all the trees beginning with the first if he starts from the well ?
2) The sum of the first ten terms of an AP is four times the sum of the first five terms, then the ratio of the first term to the common difference is
3) Common difference of sequence 5,8,11,14,… is
4) 1,8,15,22,29,36,… is
5) Second term of sequence with general term n2 - 4/2 is