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  • Question

  • When 721 + 722 + 723 + 724 is divided by 25 the remainder is:


  • Options
  • A. 5
  • B. 17
  • C. 7
  • D. 0

  • Correct Answer
  • 0 

    Explanation

    Given, 7 21 + 7 22 + 7 23 + 7 24

    7 21 (1 + 7 + 49 + 343)
    7 21 (400)

    Now, 400 is divisible by 25. The remainder will be 0

    • Tags: AIEEE, Bank Exams, CAT

    Simplification problems

    Search Results

    • 1. If 9 * 6 = 45, 7 * 4 = 33, and 6 * 4 = 20, then what is the value of 5 * 3?

    • Options
    • A. 24
    • B. 16
    • C. 13
    • D. 10
      • Discuss
    • 2. Mr. Ankit is on tour to Siachin and he has Rs. 360 for his expenditure. If he exceeds his tour by 4 days, he must trim down his daily expenditure by Rs.3. Forhow many days is Mr. Ankit is on tour?

    • Options
    • A. 20
    • B. 22
    • C. 24
    • D. 26
      • Discuss
    • 3. If a2b+c=b2C+a=a2a+b=1 then 11+a+11+b+11+c is

    • Options
    • A. 1
    • B. 2
    • C. 3
    • D. 4
      • Discuss
    • 4. Find the greatest number that will divide 390, 495 and 300 without leaving a remainder

    • Options
    • A. 5
    • B. 15
    • C. 25
    • D. 35
      • Discuss
    • 5. If x +y = ?3 and x - y = ?2, then the value of 8xy (x2 + y2) is

    • Options
    • A. 6
    • B. ?6
    • C. 5
    • D. ?5
      • Discuss
    • 6. If a.sin 45°.cos 45°.tan60° = tan 245° cos60° then find the value of a ?

    • Options
    • A. 13
    • B. 3
    • C. 1
    • D. 32
      • Discuss
    • 7. The angle of elevation of the top of a tower from a point A on the ground is 30°. On moving a distance of 20 metres towards the foot of the tower to a point B, the angle of elevation increases to 60°. The height of the tower in meters is

    • Options
    • A. ?3
    • B. 5?3
    • C. 10?3
    • D. 20?3
      • Discuss
    • 8. If 5 sec ? ? 3 tan ? = 5, then what is the value of 5 tan ? ? 3 sec ??

    • Options
    • A. 1
    • B. 2
    • C. 3
    • D. 4
      • Discuss
    • 9. If 4(x+y) = 256 and (256)(x-y) = 4 , then what is the value of x and y?

    • Options
    • A. 17/8, 15/8
    • B. 17/4, 15/4
    • C. 9/17, 15/17
    • D. 8/17, 8/15
      • Discuss
    • 10. If m n = 2 , mn = 15 , (m , n > 0) then the value of m2-n2m3-n3

    • Options
    • A. 1856
    • B. 1658
    • C. 1586
    • D. 1568
      • Discuss

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