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S1 help on discrete random variables!

I cant seem to do this question, can somebody give me a hand? I can't seem to do part e!

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Basically you find all the combinations of what X1 and X2 could be that satisfy the inequality (i.e. they have to be more than 1, but equal to 3 or less), then you add up the probabilites of the combinations occurring:

Spoiler

(edited 10 years ago)

Reply 2

justinawe

Original post by Piguy

Spoiler

I'm pretty sure there's no "inequality" as such for

X_1 + X_2

, combinations like (3,2) and (1,3) etc should still be possible.

Reply 3

piguy

Original post by justinawe

I'm pretty sure there's no "inequality" as such for

X_1 + X_2

, combinations like (3,2) and (1,3) etc should still be possible.

Woops, looking at f, silly me

Reply 4

piguy

In that case you just need to find the combinations of what X1 + X2 could be:

Spoiler

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