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Home Aptitude Problems on Numbers See What Others Are Saying!
  • Question
  • Which one of the following is not a prime number?


  • Options
  • A. 91
  • B. 71
  • C. 41
  • D. 31

  • Correct Answer
  • 91 

    Explanation

    Prime Numbers :: Numbers which are divisible by only 1 and itself are Prime Numbers.

     

    It's answer will be 91.

    Because 91 can be divisible by 7,13,91,1.

    It is quite clear that prime number should be divisible only by itself and by 1.

  • Tags: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO, IT Trainer

    More questions

    • 1. 
      If 8 men can reap 80 hectares in 24 days, then how many hectares can 36 men reap in 30 days?

    • Options
    • A. 350
    • B. 460
    • C. 425
    • D. 450
    • Discuss
    • 2. 
      If a quarter Kg of potato costs 60 paise, How many paise will 200 gm cost?

    • Options
    • A. 48
    • B. 45
    • C. 59
    • D. 72
    • Discuss
    • 3. 
      An industrial loom weaves 0.128 meters of cloth every second. Approximately, how many seconds will it take for the loom to weave 25 meter of cloth?

    • Options
    • A. 184
    • B. 195
    • C. 190
    • D. 197
    • Discuss
    • 4. 
      If on a marked price, the difference of selling prices with a discount of 30 % and two successive discounts of 20 % and 10 % is ? 72, then the marked price (in ?) is

    • Options
    • A. ? 3600
    • B. ? 3000
    • C. ? 2500
    • D. ? 2400
    • Discuss
    • 5. 
      If one of the roots of the equation x 2 - bx + c = 0 is the square of the other, then which of the following option is correct?

    • Options
    • A. b3 = 3bc + c2 + c
    • B. c3 = 3bc + b2 + b
    • C. 3bc = c3 + b2 + b
    • D. 3bc = c3 + b3 + b2
    • Discuss
    • 6. If the number 517*324 is completely divisible by 3, then the smallest whole number in the place of * will be:

    • Options
    • A. 0 
    • B. 1
    • C. 2
    • D. None of these
    • Discuss
    • 7. 
      If 2x + 3y = 29 and y = x + 3, what is the value of x?

    • Options
    • A. 4
    • B. 5
    • C. 6
    • D. 7
    • Discuss
    • 8. 
      Total wages of 3 men, 2 women and 4 boys is ? 26. If the wages of 3 men is equal to that of 4 women and the wages of 2 women is equal to that of 3 boys, then find out the total wages of 4 men, 3 women and 2 boys.

    • Options
    • A. ? 29
    • B. ? 35
    • C. ? 65
    • D. ? 20
    • Discuss
    • 9. 
      If [? 3 + x + ? 3 - x] / [? 3 + x - ? 3 - x] = 2, then x is equal to

    • Options
    • A. 5/12
    • B. 12/5
    • C. 5/7
    • D. 7/5
    • Discuss
    • 10. 
      The sum of two numbers is 25 and their difference is 13. Find their product.

    • Options
    • A. 104
    • B. 114
    • C. 315
    • D. 325
    • Discuss


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