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21. Choose the correct answer.
If A is real and 1 + A + A2 + A3 = 40, then A is equal to:
A) -3
B) -1
C) 1
D) 3
Ans. d
22. Choose the correct answer.
(1 + 3 + 5 + … + 3983) / 1992 = ?
A) 1988
B) 1992
C) 1990
D) None of these
Ans. b
23. Choose the correct answer.
What is the highest power of 82 contained in 83!-82! ?
A) 3
B) 2
C) 32
D) None of these
Ans. a
24. Choose the correct answer.
If the digit in the units place of a square natural number is 6, then the digit in the tens place will be:
A) 1
B) 3
C) Even
D) Odd
Ans. d
25. Choose the correct answer.
The equations 2x+3y-7=0 and 10x+15y-35=0 are :
A) Consistent and have unique solution
B) Consistent and have infinitely many solutions
C) inconsistent
D) None of these
Ans. b