- (A) 123
- (B) 125
- (C) 127
- (D) 129
_______ was formed in 1922 under the leadership of Vladimir Lenin.
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Complete the series: 1, 3, 7, 15, 31, 63, _______?
Complete the series: 1, 3, 7, 15, 31, 63, _______?
Correct option is (C) 127
Solution:
The series follows the pattern of doubling the previous number and then adding 1
1 × 2 + 1 = 3
3 × 2 + 1 = 7
7 × 2 + 1 = 15
15 × 2 + 1 = 31
31 × 2 + 1 = 63
63 × 2 + 1 = 127
So, option (C) 127 is correct
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