81*82*83*84*85*86*87*88*89=?

• 89p9 is the answer.
  
• 10 years agoHelpfull: Yes(16) No(8)
• @pallavi mitra --- how is (90-9) = 90(1-9) ???? PLEASE ELABORATE..
• 10 years agoHelpfull: Yes(3) No(1)
• the series can be written as:
  (90-9)*(90-8)*(90-7)*(90-6)*(90-5)*(90-4)*(90-3)*(90-2)*(90-1)
  =90*{(1-9)*(1-8)*(1-7)*(1-6)*(1-5)*(1-4)*(1-3)*(1-2)*(1-1)}
  =-90*8*7*6*5*4*3*2*0
  =0
• 10 years agoHelpfull: Yes(1) No(21)
• can be solved by checking option by calculating unit digit
• 10 years agoHelpfull: Yes(0) No(4)
• what abt if unit digit is same in all optin
• 10 years agoHelpfull: Yes(0) No(1)