Q47 / 90 · JEE Main 2022 (26 Jul Shift 1) · Mathematics

Let E1,E2,E3 be three mutually exclusive events such that PE1=2+3p6,PE2=2-p8 and PE3=1-p2. If the maximum and minimum values of p are p1 and p2 then p1+p2 is equal to:

  • A
    23
  • Correct answer
    B
    53
  • C
    54
  • D
    1

Solution

We know that,

0≤PEi≤1for i=1,2,3

0≤PE1≤1

⇒0≤2+3P6≤1

⇒P∈-23,43 ........i

Now for 0≤PE2≤1

⇒0≤2-P8≤1

⇒P∈-6,2........ii

Now for 0≤PE3≤1

⇒0≤1-P2≤1

⇒P∈-1,1.......iii

Also, E1 and E2 and E3 are mutually exclusive

PE1+PE2+PE3≤1

⇒0≤1312-P8≤1

⇒P∈23,263...........iv

Now taking intersection of all we get,

23≤P≤1

So maximum value p1=1 and minimum value p2=23

So, p1+p2=53

Hence, the correct answer is option: 'B'.

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