# Choose the correct alternative from the given ones that will complete the series:

Directions: In the following Four questions, a series is given with one (or more) term missing. Choose the correct alternative from the given ones that will complete the series:

1. C4X, F9U, I16R, ?
(a) L25P
(b) L25U
(c) L27P
(d) K25P
2. 15, 21, 57, ____, 221
(a) 96
(b) 108
(c) 121
(d) 126
3. 720, 180, 176, 44, 40, 10, ___
(a) 6, 2
(b) 4, 2
(c) 6, 4
(d) 8, 6
4. 5, 10, 20, 40, 80, ___
(a) 120
(b) 140
(c) 150
(d) 160
Anurag Mishra Professor Asked on 8th February 2016 in
1.  L25O                  (All options are wrong)

Explanation:-
C (3) + 3 = F (6),  4 + 5 = 9  &  X – 3 = U,
F (6)  + 3 = I ((9),  9 + 7 = 16  &  U – 3 = R,

Same as,
I (9)  + 3 = L (12),   16 + 9 = 25  & R – 3 = O.

Then, the next  term will be L25O.

Hence, the correct answer is L25O.

2. (c) 121

Explanation:-

3. (a) 6, 2

Explanation:-
720 / 4 = 180,   180 – 4 = 176,  176/4 = 44,  44 – 4 = 40,  40/4 = 10,
Same as,
10 – 4 = 6 & 6/4 = 1.5
= 2 (Approx)
Then, the next number is 6, 2.

Hence, the correct answer is option (a) 6, 2.

4.  (d) 160

Explanation:-
5 x 2 = 10,  10 x 2 = 20,  20 x 2 = 40,  40 x 2 = 80,

Same as,
80 x 2 = 160.

Then, the next number will be 160.

Hence, the correct answer is option (d) 160.

Anurag Mishra Professor Answered on 8th February 2016.

Excuse me!! where is the explanation of question no.2 ???

Anirban Default Answered on 3rd April 2016.