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Question Number 65423 by byaw last updated on 29/Jul/19

Commented by mr W last updated on 29/Jul/19

$a l l p r i m e s a r e n o t d i v i s i b l e$ $b y 3 a n d 5 .$
	Answered by mr W last updated on 29/Jul/19

	$f r o m 1 t o 30 t h e r e a r e 10 p r i m e s . t h e y$ $a r e a l l n o t d i v i s i b l e b y 3 a n d 5 .$ $p = \frac{10}{30} = \frac{1}{3}$
	Commented by Rasheed.Sindhi last updated on 30/Jul/19

	$S i r, I t h i n k t h a t t h e r e a r e 8 s u c h p r i m e s$ $(E x c l u d i n g 3 a n d 5 b e c a u s e t h e y a r e$ $d i v i s i b l e b y 3 a n d 5 r e s p e c t l y)$ $2, 7, 11, 13, 17, 19, 23, 29 .$
	Commented by MJS last updated on 30/Jul/19

	$mathematical language has to be accurate$ $‘ ‘ 3 and 5^{″} \neq ‘ ‘ 3 or 5^{″} \neq ‘ ‘ 3 xor 5^{″}$ $x divisible by 3 and 5 \Rightarrow x = 15 n$ $x divisible by 3 or 5 \Rightarrow x = 3 n or x = 5 n or x = 15 n$ $x divisible by 3 xor 5 \Rightarrow (x = 3 n or x = 5 n) and x \neq 15 n$ $[n, k \in Z]$
	Commented by Rasheed.Sindhi last updated on 30/Jul/19

	${Y o u}^{'} r e v e r y r i g h t s i r . I {d i d n}^{'} t c a r e o f t h a t!$
	Commented by mr W last updated on 30/Jul/19

	$i a g r e e w i t h M J S s i r .$ $w h a t R a s h e e d s i r m e a n s i s p r o b a b l y$ $w h a t t h e q u e s t i o n r e a l l y m e a n s, b u t$ $t h e q u e s t i o n u s e s a n i n a c c u r a t e$ $l a n g u a g e .$
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