Mathematics JAMB, WAEC, NECO AND NABTEB Official Past Questions

43

For what of n is n+1C3 = 4(nC3)?

  • A. 6
  • B. 5
  • C. 4
  • D. 3
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44

The pie chart above shows the expenditure of a family whose income is N30,000. If the expenditure on food is twice that on housing and that on school fees is twice that on transport, how much does the family spend on food?

  • A. N 28 000
  • B. N 25 500
  • C. N15 000
  • D. N 12 500
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45

The table above shows the distribution of recharge cards of four major GSM operators. What is the probability that a recharge card selected at random will be GTN or Qtel?

  • A. 3/20
  • B. 1/4
  • C. 2/5
  • D. 3/4
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46

Find the variance of 2x, 2x-1 and 2x+1

  • A. 2/3
  • B. 2
  • C. √(2/3)
  • D. 1
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47

A bag contains 5 black, 4 white and x red marbles. If the probability of picking a red marble is 2/5, find the value of x

  • A. 8
  • B. 10
  • C. 4
  • D. 6
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48

If the mean of five consecutive integers is 30, find the largest of the numbers

  • A. 28
  • B. 30
  • C. 32
  • D. 34
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49

A final examination requires that a student answer any 4 out of 6 questions. In how many ways can this be done?

  • A. 15
  • B. 20
  • C. 30
  • D. 45
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50

The table above shows the scores of a group of students in a physics test. If the mode is m and the number of students who scored 4 or more is n, what is (n, m)?

  • A. (33, 4)
  • B. (22, 4)
  • C. (33, 12)
  • D. (12, 4)
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