Information and Communication Technology - Number System

6. Which is the only even prime number?

  • Option : C
  • Explanation : 2 is the only even prime number.
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7. The first prime number is

  • Option : C
  • Explanation : 2 is the first prime number.
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8. A number is three times the another number. If sum of both the numbers is 20, then find them

  • Option : A
  • Explanation : Given, x= 3y and x + y = 20 ⇒ 4y = 20 ⇒Y = 5 ∴  x = 3y =3 x 5 = 15
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9. Sum and difference of two numbers are 21 and 11, respectively. Find the greater number.

  • Option : B
  • Explanation : Given, x+ y = 21 and x-y = 11 ∴ x= 16 and y=5
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10. 944 - 307 + 119 is equal to

  • Option : B
  • Explanation : 944 - 307 + 119= (944 + 119) -307 = 1063 - 307 = 756
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