1
NDA Mathematics 14 November 2021
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
If x2 + x + 1 = 0, then what is the value of x199 + x200 + x201
A
-1
B
0
C
1
D
3
2
NDA Mathematics 14 November 2021
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language

If x, y, z are in GP, then which of the following is/are correct?

1. ln(3x), ln(3y), ln(3z) are in AP

2. xyz + ln(x), xyz + ln(y), xyz + ln(z) are in HP

Select the correct answer using the code given below.

A
1 only
B
2 only
C
Both 1 and 2
D
Neither 1 nor 2
3
NDA Mathematics 14 November 2021
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
If  log102,  log10(2x - 1), log10(2x + 3) are in AP, then what is x equal to?
A
0
B
1
C
log25
D
log52
4
NDA Mathematics 14 November 2021
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
Let S = {2, 3, 4, 5, 6, 7, 9}. How many different 3-digit numbers (with all digits different) from S can be made which are less than 500?
A
30
B
49
C
90
D
147
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