WB JEE 2022 | Probability Question 12 | Mathematics

WB JEE 2022

MCQ (Single Correct Answer)

-0.25

A determinant is chosen at random from the set of all determinants of order 2 with elements 0 or 1 only. The probability that the determinant chosen is non-zero is

$${3 \over {16}}$$

$${3 \over 8}$$

$${1 \over 4}$$

$${5 \over 8}$$

WB JEE 2021

MCQ (Single Correct Answer)

-0.25

Four persons A, B, C and D throw and unbiased die, turn by turn, in succession till one gets an even number and win the game. What is the probability that A wins the game if A begins?

$${1 \over 4}$$

$${1 \over 2}$$

$${7 \over 15}$$

$${8 \over 15}$$

WB JEE 2020

MCQ (Single Correct Answer)

-0.25

Four persons A, B, C and D throw an unbiased die, turn by turn, in succession till one gets an even number and win the game. What is the probability that A wins if A begins?

$${1 \over 4}$$

$${1 \over 2}$$

$${7 \over 12}$$

$${8 \over 15}$$

WB JEE 2020

MCQ (Single Correct Answer)

-0.25

A rifleman is firing at a distant target and has only 10% chance of hitting it. The least number of rounds he must fire to have more than 50% chance of hitting it at least once, is

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