यदि `56 xx 11 = 9, 37 xx 13 = 6, 42 xx 12 = 3`, तो `87 xx 77` का मान बताइए ।

Options

A. 1
B. 2
C. 3
D. 4

Answer

A

Explanation

`56 xx 11 = 9`
` rArr 56 - 11 = 9`
`rArr 45 rArr 4 + 5 = 9`
`37 xx 13 = 6`
`rArr 37 - 13 = 6`
`rArr 24 rArr 2 + 4 = 6`
`42 xx 12 = 3`
`rArr 42 - 12 = 3`
`rArr 30 rArr 3 + 0 = 3`
अतः ,
`87 xx 77`
`rArr 87 - 77 = 10 rArr 1 + 0 = 1`