Question 21

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Jambmaths question: 

GSM

Operator

GTN

PLO

QTEL

CMob

No of Recharge card

5

6

3

6

The table above shows major GSM operator. What is the probability that a recharge selected at random will be GTN or Qtel

Option A: 

$\tfrac{2}{5}$

Option B: 

$\tfrac{3}{4}$

Option C: 

$\tfrac{3}{20}$

Option D: 

$\tfrac{1}{4}$

Jamb Maths Solution: 

Total Recharge card 5 + 6 + 3 + 6 =20

Prob of GTN = $\frac{5}{20}=\frac{1}{4}$

Prob of Qtel = $\frac{3}{20}$

Prob of GTN or Qtel = $\frac{1}{4}+\frac{3}{20}=\frac{8}{20}=\frac{2}{5}$

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