7+2=59,5+3=28,9+1=810 എങ്കിൽ 5+4= .....A20B19C239D91Answer: B. 19 Read Explanation: 7+2=59(7-2=5,7+2=9) 5+3=28(5-3=2,5+3=8) 9=1=810(9-1=8,9+1=10) 5+4=19(5-4=1,5+4=9)Read more in App