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2,5,9,?,20,27, what will replace the question mark ?

  • 13
  • 14
  • 15
  • 16

Answer: Option B

Explanation:

Pattern is +3,+4,..,..,+7, so +5 and +6 will be in the blanks

Question mark will be replaced by 9+5 = 14

Similar Questions :

1. Which number should be replaced with x in following series :

2, 3, 5, 7, 11, x, 17

  • 12
  • 13
  • 14
  • 15

Answer: Option B

Explanation:

Above series contains prime number series. So after 11, 13 is next prime number.

2. Which number would replace the question mark in series
7,12,19,?,39

  • 24
  • 28
  • 31
  • 33

Answer: Option B

Explanation:

Pattern is , +5, +7, +9
Missing Number = 19+9 = 28

3. 36, 34, 30, 28, 24, ... What number should come next?

  • 22
  • 20
  • 18
  • 16

Answer: Option A

Explanation:

Pattern in the series is, -2, -4, -2, -4. So next term will be -2
24 -2 = 22

4. 5,9,17,29,45, ?

  • 50
  • 60
  • 65
  • 70

Answer: Option C

Explanation:

In this series the pattern is +4, +8, +12, +16, so next will be +20

Term which will replace the question mark in this series will be 45+20 = 65

5. In the series 3, 9, 15.. what will be the 21st term ?

  • 123
  • 126
  • 129
  • 136

Answer: Option A

Explanation:

We can judge that it is A.P.
With 6 as difference
nth term in A.P. = a+(n-1)d
a= 3, n = 21, d = 6
So, 21st term will be = 3+(20)6 = 123

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