SECTION A Question numbers 1 to 6 carry 2 marks each. (a) Find the sum of first 30 terms of AP : - 30, - 24, - 18, ...... 2 OR (b) In an AP if Sn = n (4n + 1), then find the AP. 2 2. A solid metallic sphere of radius 10.5 cm is melted and recast into a number of smaller cones, each of radius 3.5 cm and height 3 cm. Find the number of cones so formed. 2 3. (a) Find the value of m for which the quadratic equation (m - 1) x2 + 2 (m - 1) x +1=0 has two real and equal roots. 2 OR (b) Solve the following quadratic equation for x : 2 V3 x2 + 10x + 7V3 = 0 4. Find the mode of the following frequency distribution : 2 Class 10 -20 20 - 30 30 - 40 40 - 50 50 - 60 Frequency 15 10 12 17 4