1
NDA Mathematics 14th September 2025
MCQ (Single Correct Answer)
+2.5
-0.833
What is the harmonic mean of the numbers C(10,3) C(10,4) C(10,5) C(10,6) and C(10,7) ?
2
NDA Mathematics 13 April 2025
MCQ (Single Correct Answer)
+2.5
-0.833
The sum of the first k terms of a series S is . Which one of the following is correct?
3
NDA Mathematics 13 April 2025
MCQ (Single Correct Answer)
+2.5
-0.833
The sum of the first 8 terms of a GP is five times the sum of its first 4 terms. If ≠ is the common ratio, then what is the number of possible real values of r?
4
NDA Mathematics 13 April 2025
MCQ (Single Correct Answer)
+2.5
-0.833
If 5th, 7th and 13th terms of an AP are in GP, then what is the ratio of its first term to its common difference?
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