[B].
[C].
[D].
Answer: Option E
Explanation:
2nd term = (1st term) x 1 + 1 = 15 x 1 + 1 = 16.
3rd term = (2nd term) x 2 + 2 = 16 x 2 + 2 = 34.
4th term = (3th term) x 3 + 3 = 34 x 3 + 3 = 105.
5th term = (4th term) x 4 + 4 = 105 x 4 + 4 = 424
6th term = (5th term) x 5 + 5 = 424 x 5 + 5 = 2125
6th term should 2125 instead of 2124.
[B].
[C].
[D].
Answer: Option D
Explanation:
2nd term = (1st term) x 3 – 4 = 10 x 3 – 4 = 26.
3rd term = (2nd term) x 3 – 4 = 26 x 3 – 4 = 74.
4th term = (3th term) x 3 – 4 = 74 x 3 – 4 = 218.
5th term = (4th term) x 3 – 4 = 218 x 3 – 4 = 650.
5th term must be 650 instead of 654.
[B].
[C].
[D].
Answer: Option C
Explanation:
Each even term of the series is obtained by multiplying the previous term by 2.
2nd term = (1st term) x 2 = 6 x 2 = 12
4th term = (3rd term) x 2 = 48 x 2 = 96.
6th term = (5th term) x 2 = 384 x 2 =768.
4th term should be 96 instead of 100.
[B].
[C].
[D].
Answer: Option E
Explanation:
Numbers must be (14)2, (13)2, (12)2, (11)2, (10)2, (9)2, (8)2.
So, 80 is wrong.
[B].
[C].
[D].
Answer: Option E
Explanation:
A x 2 + 1, B x 3 + 1, C x 2 + 1, D x 3 + 1 and so on.
So, 356 is wrong.
[B].
[C].
[D].
Answer: Option C
Explanation:
Go on multiplying 2 and adding 1 to get the next number.
So, 39 is wrong.
[B].
[C].
[D].
Answer: Option C
Explanation:
Go on subtracting 3 and dividing the result by 2 to obtain the next number.
Clearly, 46 is wrong.
[B].
[C].
[D].
Answer: Option B
Explanation:
Go on dividing by 6, 5, 4, 3, 2, 1 respectively to obtain the next number.
Clearly, 92 is wrong.
[B].
[C].
[D].
Answer: Option B
Explanation:
Go on adding 7, 9, 11, 13, 15, 17 respectively to obtain the next number.
So, 33 is wrong. It must be 35
[B].
[C].
[D].
Answer: Option C
Explanation:
Go on multiplying the number by 2 and adding 1 to it to get the next number.
So, 27 is wrong.