161?85?65?89=100
then use + or - in place of ? and take + as m,- as n then find value of m-n
Choose the correct answer
A) 3  B) -1  C) 1  D) -3  E) 2
161-85-65+89= 
<gadget id="calculator">161-85-65+89</gadget>
<output>100</output>
100   so m=1, n=2 =&gt; (m-n)=-1   ANSWER:-1
<result>B</result>
161?85?65?89=100
then use + or - in place of ? and take + as m,- as n then find value of m-n