CBSE Class 10th Mathematics Question Paper 2012, CBSE Delhi Class 10th (X) 2012 Mathematics Question Paper CBSE Class X Mathematics Question Paper 2012 outside Delhi Students Free Download CBSE 10th – X Mathematics Question Paper for Foreign Students with Answers and Solution 2012 CBSE Board Exam Papers for Class 12 (XII) std CBSE 2012 Mathematics Question Bank with Full Details

** Mathematics **

If the flth term of an A.P. is (2n + 1.), then the sum of its first three terms is 6n+3

15

‘2

21

A solid right circular cone is cut into two parts at the middle of its height by a plane parallel to its base. The ratio of the volume of the smaller cone to the whole cone is

(A) 1:2

(B) 1:4

(C) 1:6

(D) 1:8

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CBSE 10th Mathematics Question Paper 2012