1.

7, 2=59, 5, 3 = 28, 9, 1 = 180, 2, 1 = 13, 5, 4 = ?A. 19B. 9C. 20D. 239

Answer» Correct Answer - A
`7-2=5, 7+2=9`
`rArr7, 2=59`
`5-3=2,5+3=8`
`rArr5, 3=28`
`9-1=8, 9+1=10`
`rArr9, 1=810`
`2-1=1,2+1=3`
`rArr2, 1=13`
अतः
`5-4=1,5+4=9`
`rArr5, 4=19`


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