Question

(i) 337, 211, 121, __, 25, 7
(A) 101 (B) 61
(C) 64 (D) 27
2. 49, 925, 2549, ?, 121169
(A) 64121 (B) 100121
(C) 49121 (D) 4981
3. 1, 7, 8, 15, 23, 38, ?
(A) 62 (B) 61
(C) 54 (D) 51
please answer all with detailed explanations

Answer 1

I got the last one.
You just add the previous two numbers to get your answer.
1 + 7 = 8
7 + 8 = 15
8 + 15 = 23
15 + 23 = 38
23 + 38 = 61
Therefore, answer is (B) 61.
I will update the answer as soon as I solve the other ones.

Answer 2

1).  7^3 - 6 = 343-7 = 337 
   6^3 - 5 = 216-5 = 211 
   5^3 - 4 = 125-4 = 121    
   4^3 - 3 = 64 - 3 = 61 
   3^3 - 2 =  27 - 2 = 25 
    2^3 - 1 = 8 - 1  = 7 
3).
You just add the previous two numbers to get your answer.
1 + 7 = 87 + 8 = 158 + 15 = 2315 + 23 = 3823 + 38 = 61
Therefore, answer is (B) 61.