1000+ Aptitude Number System Questions and Answers - 2
Question: 6
What is the minimum number of four digits formed by using the digit 2, 3, 0, 7?
(A) 2047
(B) 2247
(C) 2407
(D) 2470
Ans: A
Required number = 2047.
Question: 7
The sum of the greatest and smallest number of five digits is
(A) 10,999
(B) 109,999
(C) 11,110
(D) 111,110
Ans: B
Required sum = (99999 + 10000) = 109999.
Question: 8
38649 – 1624 – 4483 = ?
(A) 32425
(B) 32452
(C) 34522
(D) 32542
Ans: D
Given expression = 38649 – (1624 + 4483)
= 38649 – 6107 = 32542.
Question: 9
587 x 999 = ?
(A) 586413
(B) 587523
(C) 614823
(D) 615173
Ans: A
587 x 999
= 587 x (1000 – 1)
= (587 x 1000) – (587 x 1)
= 587000 – 587
= 586413.
Question: 10
The sum of the first four primes is
(A) 10
(B) 11
(C) 16
(D) 17
Ans: D
Sum of first four prime numbers = (2 + 3 + 5 + 7) = 17.
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