1
NDA Mathematics 10 April 2022
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language

If a, b, c are in GP where a > 0, b > 0, c > 0, then which of the following are correct?

1. a2, b2, c2 are in GP

2. $\frac{1}{a}, \frac{1}{b}, \frac{1}{c}$ are in GP

3. $\sqrt {a}, \sqrt{b}, \sqrt{c} $ are in GP

Select the correct answer using the code given below :

A
1 and 2 only
B
2 and 3 only
C
1 and 3 only
D
1, 2 and 3
2
NDA Mathematics 10 April 2022
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
If $\frac{a+b}{2}, b, \frac{b+c}{2}$ are in HP, then which one of the following is correct?
A
a, b, c are in AP
B
a, b, c are in GP
C
a + b, b + c, c + a are in GP
D
a + b, b + c, c + a are in AP
3
NDA Mathematics 10 April 2022
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
If the sum of the first 9 terms of an AP is equal to sum of the first 11 terms, then what is the sum of the first 20 terms ?
A
20
B
10
C
2
D
0
4
NDA Mathematics 10 April 2022
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
If the 5th term of an AP is $\frac{1}{10}$ and its 10th term is $\frac{1}{5},$ then what is the sum of first 50 terms ?
A
25
B
25⋅5
C
26
D
26⋅5
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