How many prime numbers between 100 to 150?	Pick one: A) 11 B) 10 C) 13 D) 12 E) 15
primes are of the form 6n+1 or 6n-1   Put n=17   6n+1=6*17+1= 
<gadget id="calculator">6*17+1</gadget>
<output>103</output>
103   for n=17   6n-1=6*17-1= 
<gadget id="calculator">6*17-1</gadget>
<output>101</output>
101   for n=18 , ==&gt;107 and 109   for n=19 , ==&gt; 113   for n =20 ==&gt; no prime no.   for n =21 ==&gt; 127   for n =22 ==&gt; 131   for n=23 ==&gt; 137 AND 139   for n =24 ==&gt; no prime number   for n= 25 ==&gt; 149   therefore total number of prime numbers = 10   Ans - 10
<result>B</result>
How many prime numbers between 100 to 150?