# Aptitude [Tech Mahindra Placement]: Sample Questions 5 - 7 of 42

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## Question 5

Aptitude

### Question

MCQ▾Complete the following series.

1, 2, 3, 5,7, 11, ________

### Choices

Choice (4) | |
---|---|

a. | 9 |

b. | 13 |

c. | 12 |

d. | 15 |

### Answer

d.### Explanation

- First term of the series is 1.
- Second term of the series is 2, i.e.. 1 + 1 = 2
- Third term of the series is 3, i.e.. 2 + 1 = 3
- Fourth term of the series is 5, i.e.. 3 + 2 = 5
- Fifth term of the series is 7, i.e.. 5 + 2 = 7
- Sixth term of the series is 11, i.e.. 7 + 4 = 11
- Here, terms are in increasing difference of 1, 1, 2, 2, 4,4, 8, … .
- So, next term will be .

## Question 6

Aptitude

### Question

MCQ▾Complete the following series.

ay, bz, cw, dx, ________

### Choices

Choice (4) | |
---|---|

a. | ev |

b. | fv |

c. | gu |

d. | eu |

### Answer

d.### Explanation

- Alphabets in series is: abcdefghijklmnopqrstuvwxyz
- Alphabets in reverse order is: zyxwvutsrqponmlkjihgfedcba

- First term of the series is ay.
- Second term of the series is bz.
- Third term of the series is cw.
- Fourth term of the series is dx.
- Following the same analogy, fifth term will be eu.

## Question 7

Aptitude

### Explanation

- First term of the series is 192. Square of 14 is 196 and subtracting 4 from it, we will get 192, i.e..
- Second term of the series is 221. Square of 15 is 225 and subtracting 4 from it, we will get 221, i.e..
- Third term of the series needs to be find out.
- Fourth term of the series is 285. Square of 17 is 289 and subtracting 4 from it, we will get 285, i.e..
- Fifth term of the series is 320. Square of 18 is 324 and subtracting 4 from it, we will get 320, i.e..
- Following the same pattern, we can find the third term.
- Third term should be square of 16 minus 4, i.e..
- Missing term of the series is 252.