# Number System

Number System Questions: What is Number System in Maths? Divisibility Rules for 7, Divisibility Rules for 11, Binomial Theorem Questions, Factorize Expressions

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## Online Aptitude Questions with Answers on Number System

Q56. **What is the difference between the largest number and the least number written with the digits 7, 3, 1, 4?**

1.  6084
2.  6184
3.  5084
4.  6048

Solution : 6084
Q57. **What is the difference between the largest and the smallest number written with 7, 7, 0, 7?**

1.  6893
2.  6993
3.  6009
4.  693

Solution : 693

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Q58. **Which one of the following is the sum of the numbers 1, 3, 5, 7, 9…. up to nth number?**

1.  N(N + 1)
2.  N(N + 1)/2
3.  N^2 + 1
4.  N^2

Solution : N^2
Q59. **Which one of the following represents the sum of the first n even numbers?**

1.  N(N – 1)
2.  N(N + 1)
3.  N2+ 1
4.  N2

Solution : N(N + 1)

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Q60. **What is the sum of all even numbers from 1 to 701?**

1.  122500
2.  122550
3.  123850
4.  122850

Solution : 122850
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