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Question Number 55860 by Easyman32 last updated on 05/Mar/19

	Answered by tanmay.chaudhury50@gmail.com last updated on 05/Mar/19

	$j o n e s p r o b a b l i t y o f w i n n i n g = a$ $j o h n p r o b a b l i t y o f w i n n i n g = 3 a$ $d a v i d . . . . = 2 \times 3 a = 6 a$ $a + 3 a + 6 a = 1$ $a = \frac{1}{10}$ $j o h n p r o b a b l i t y = \frac{3}{10}$ $p l s c h e c k . . .$
	Answered by tanmay.chaudhury50@gmail.com last updated on 05/Mar/19

	$33) p a s d i n m a t h = p$ $f a i l i n m a t h = 1 - p$ $p a s s i n p h y s i c s = q$ $f a i l i n p h y s i c s = 1 - q$ $p a s s i n m a t h b u t f a i l i n p h y s i c s = p (1 - q)$
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