`1^2, 5^2, 7^2, 73, ....`

Find the sum of the following series : 3.1^2+5.2^2+7.3^2 + .... to n terms .

Find the mode for the following series: 7.5, 7.3, 7.2, 7.2, 7.4, 7.7, 7.7, 7.5, 7.3, 7.2, 7.6, 7.2

Find the mode for the following series: 7.5, 7.3, 7.2, 7.2, 7.4, 7.7, 7.7, 7.5, 7.3, 7.2, 7.6, 7.2

Find the sum to 'n' terms of 3.1^(2)+5.2^(2)+7.3^(2)+ ........

Find the sum of the following series to n term: 3.1^2+5.2^2+7.3^2+……..

If D (-(1)/(2),(5)/(2)) , E (7,3) and F ((7)/(2),(7)/(2)) are the mid - points of sides of triangle ABC , then find the area of the triangleABC .