Three terms in A.P. are such that their sum is 45.What is the middle term?
15
30
10
25
Take the three terms as a - d,a and a+d where a is the first term and d is the common difference. Then (a - d) + a + (a + d) = 45 So, a = 15
Four numbers are in A.P. If their sum is 20 and the sum of their square is 120, then the middle terms are