यदि 14 $ 8 = 91 तथा 18 $ 4 = 51 हो , तो ...

यदि 14 $ 8 = 91 तथा 18 $ 4 = 51 हो , तो 21 $ 9 = ?

A

160

B

155

C

151

D

168

लिखित उत्तर

Verified by Experts

The correct Answer is:

A

`14 $ 8 = 91`
`rArr (14 -1) xx(8-1) = 91`
`rArr 13 xx 7 = 91`
`18 $ 4 = 51`
`rArr (18 -1) xx(4-1) = 51`
`rArr 17 xx 3 = 51`
अतः ,
`21 " "$" "9`
`rArr (21 -1) xx (9-1)`
`rArr 20 xx 8 = 160`

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