DICE

Two fair dice are thrown . find the probability that the sum of the scores on their upper faces is,
(a)less than 4 or an odd numbered. FIND NUMERATOR OF THE FRACTION.


The answer is 19.

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3 solutions

Geoff Pilling
Mar 5, 2018

Half (or 18) of the combinations are odd. And only one additional combination (a pair of ones) will give an even number.

Therefore the number of ways will be 18 + 1 = 19 18+1 = \boxed{19}

And 19 and 36 are coprime.

Raghav Malhotra
Dec 8, 2014

the sums less than 4 are 2,3and3

and the odd no.s are coming

4 times 5, 6 times 7, 4 times 9. and 2 times 11, therefore total no. of favourable outcomes are coming to be 19 and the fraction formed is19/36

therefore the numerator is '19'

Parveen Soni
Dec 8, 2014

Possible combination are
(a) sum less than 4=(1,1),(2,1),(1,2) ------->3
(b) sum is odd -----> if one of the face show odd ----> combination of 1 3 5 of first dice to 2 4 6 of second dice.----->9 combination (covers (1,2) case of (a) ) and combination of 2 4 6 of first dice to 1 3 5 of second dice.--->9 combination (covers (2,1) case of (a) )------>total 18.
So favorable outcome is 3+(18-2)=19 P(required)=19/36 & answer=19

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