up to 20,how many no. are odd and prime both?  Choose the correct choice from the following answers: A) 9 B) 5 C) 6 D) 7 E) 8
we have to calculate it manually.   odd 1,3,5,7,9,11,13,15,17,19   prime 2,3,5,7,11,13,17,19   common 3,5,7,11,13,17,19   total no. 7   answer 7
<result>D</result>
up to 20,how many no. are odd and prime both?