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GATE Questions

A) 28 | B) 56 |

C) 44 | D) 36 |

Explanation:

Given there are 9 flavours of ice creams.

Each child takes the combination of two flavours and no two children will have the same combination

This can be done by 9C2 ways i.e children.

Number of children = 9C2 = 9 x 8 / 2 = 36.

A) 540 | B) 180 |

C) 30 | D) 80 |

Explanation:

There should be 90 instead of 80

so we can have a series

5, 5x3, 15x2, 30x3, 90x2, 180x3, 540x2 and 1080x3 and so on...

A) 22 yrs | B) 21 yrs |

C) 20 yrs | D) 24 yrs |

Explanation:

Let Reena’s present age be 'K' yrs.

Given:{(K+3) x 4} - {(K-3) x 3)}

=> K = 21 yrs

So her present age is 21 yrs.

Then, her age after 1 year is 22 yrs.

A) A | B) B |

C) C | D) D |

Explanation:

6-3 = 3 9-4 = 5 (3x5=15) 15=O

7-2 = 5 7-3 = 4 (5x4=20) 20=T

9-6 = 3 5-1 = 4 (3x4=12) 12=L

Similarly, 4-1 = 3 8-5 = 1 (3x1=3) 3=C

A) 19 | B) 20 |

C) 21 | D) 27 |

Explanation:

Initialy from left 7th = kumar

from right 9th = pawan

Interchange kumar = 11th from left, from right kumar = 9th;

11+8 = 19;

8 is 1,2,3,4,5,6,7(pawan),8,9,10,11(kumar),12,13,14,15,16,17,18,19;

simply count the 9th place from right we will get total as 19.