Home
Class 14
REASONING
If 1**2=1,2**3=-1 and 3**4=-5, then find...

If `1**2=1,2**3=-1` and `3**4=-5`, then find the value of `7**9=?`

A

`-47`

B

`-29`

C

`-2`

D

`-9`

Text Solution

Verified by Experts

The correct Answer is:
A
`1**2=1`
`rArr (1+2)-(1xx2)`
`rArr 3-2=1`
`2**3=1`
`rArr (2+3)-(2xx3)=-1`
`rArr 5-6=-1`
`3**4=-5`
`rArr (3+4)-(3xx4)=-5`
`rArr 7-12=-5`
Therefore, `7**9`
`rArr (7+9-(7xx9)`
`rArr 16-63=-47`
Promotional Banner

Topper's Solved these Questions

  • SYMBOLS & NOTATIONS

    KIRAN PUBLICATION|Exercise TYPE-III|38 Videos

  • SYMBOLS & NOTATIONS

    KIRAN PUBLICATION|Exercise TYPE-I (vii)|87 Videos

  • SYLLOGISM, STATEMENT AND CONCLUSIONS

    KIRAN PUBLICATION|Exercise TYPE II|193 Videos

  • WORD FORMATION

    KIRAN PUBLICATION|Exercise TYPE-II|71 Videos

Similar Questions

Explore conceptually related problems

If A={1,2,3,4,5} and B={1,3,5,7,9} then find the value of (A-B)uu(B-A)

If A=[[1,1,2],[2,1,3],[5,4,9]] then find |A|

Find the value of |[7/3,5/3],[3/1,1/2]|

If A = {1,3,5,7,9} and B = {1,2,3,4,5} then find A cup B and A cap B .

If x=4^(log_(2)(sqrt(9^(k-1)+7))) and y=(1)/(32^(log_(2)(3^(k-1)+1)^((1)/(5)))) and xy=4 then find sum of the squares of the real values of k

Observe the following pattern 1+3=2^(2)1+3+5=3^(2)1+3+5+7=4^(2) and write the value of 1+3+5+7+9+ upto n terms.

KIRAN PUBLICATION-SYMBOLS & NOTATIONS-TYPE-II
  1. Choose the appropriate combination of signs to solve the equation. ...

    Text Solution

    |

  2. A**B means multiply A by B, A"@"B means divide A by B, A? B means add ...

    Text Solution

    |

  3. If 37**14=17, 69**33=34, 91**125=72 then what should be 28**56=?

    Text Solution

    |

  4. If 5xx3 = 19 and 8xx 5 = 49, then what should 6xx4 be? यदि 5xx3 = 1...

    Text Solution

    |

  5. Complete the third equation on the basis of a certain system followed ...

    Text Solution

    |

  6. If 4**2=3 and 8**4=3, then 21**7=?

    Text Solution

    |

  7. If 3**4=10,5**8=18,7**7=?

    Text Solution

    |

  8. Select the correct combination of mathematical signs to replace * sign...

    Text Solution

    |

  9. If 1**2=1,2**3=-1 and 3**4=-5, then find the value of 7**9=?

    Text Solution

    |

  10. Some equations are solved on the basis of certain system. Find out the...

    Text Solution

    |

  11. Some equations have been solved on the basis of a certain pattern. Fin...

    Text Solution

    |

  12. If 13**45=29,24**58=41,74**32=53, what should 97**47 be?

    Text Solution

    |

  13. Some equations have been solved on the basis of a certain pattern. Fin...

    Text Solution

    |

  14. Some equations are solved on the basis of a certain system. Find out t...

    Text Solution

    |

  15. If 38 # 49 = 24 and 96 # 51 = 21, then 87 # 78 = ?

    Text Solution

    |

  16. If 27 * 4 = 77 and 31 * 9 = 239, then 21 * 6 = ?

    Text Solution

    |

  17. If 17 ** 36= 17 and 41 ** 56= 16 then 41 * 32= ?

    Text Solution

    |

  18. If (2)**4=2 and (4)**4=16, then what is the value of A in (6)**A=18?

    Text Solution

    |

  19. If 6**9-4=58 and 3**9-7=34, then in expression A**4-9=91, what is the ...

    Text Solution

    |

  20. If 4**7**2=361 and 5**9**1=480, then 2**1**3=?

    Text Solution

    |