M4maths Previous Puzzles

30 Nov 2015 Sequence

What is the next number of the following sequence
26, 51, 100, 197, 389,......

OPtion

1) 772
2) 767
3) 786
4) 774
5) 768
6) 779
7) 789
8) 728
9) 771
10)759

Solution

26
26*2 - 1 = 52-1 = 51
51*2 - 2 = 102-2 = 100
100*2 - 3 = 200-3 = 197
197*2 - 5 = 394-5 = 389
Similarly
389*2 - 7 = 778-7 = 771
Option 9)

Correct Option: 9 Best Solution (10)

rakhi    9 years AGO

26x2=52-1=51
51x2=102-2=100
100x2=200-3=197
197x2=394-5=389
389x2=778-7=771

Like? Yes (6) | No (2)  

Meenakshi   9 years AGO

(double of given number) - (Consecutive Prime number Staring with 1) = Next number
(26+26) -1 = 51
(51+51) -2 = 100
(100+100) -3=197
(197+197) -5=389
(389+389) - 7=771

Like? Yes (3) | No (1)  

harshavi   9 years AGO

the series is as
26*2-1,
51*2-2
100*2-3
197*2-5
389*2-7=771

Like? Yes (1) | No   

sri   9 years AGO

26*2=52-1;
51*2=102-2;
100*2=200-3;
197*2=394-5;
389*2=778-7=771;

Like? Yes (2) | No (2)  

chaitanya krishna   9 years AGO

difference is 25 multiply with 2 and subtract one for the following two consecutive numbers after that subtract two

Like? Yes (3) | No (3)  

Ritesh kumar   9 years AGO

26 51 100 197 389 ... next is 771
double the number and subtract the prime number
389*2=778
778-7=771

Like? Yes (2) | No (2)  

Pragati Rode   9 years AGO

second number = (first number * 2 ) - 1
third number = (second number * 2 ) - 2
fourth number = (third number * 2 ) - 3
fifth number = (fourth number * 2 ) - 5
so
sixth number = (fifth number * 2 ) - 7
i.e. (389 * 2 ) - 7 = 771
option 9)

Like? Yes (1) | No (1)  

sahil arora   9 years AGO

26*2-1=51
51*2-2=100
100*2-3=197
197*2-5=389
389*2-7=771
prime number are substracted

Like? Yes (2) | No (2)  

jalaj   9 years AGO

26 *2=52-1=51
51*2=102-2=100
100*2=200-3=197
197*2=394-5=389
389*2=778-7=771

Like? Yes (1) | No (2)  

RAHUL KUMAR   9 years AGO

26*2-1=51
51*2-2=100
100*2-3=197
197*2-5=389
389*2-7=771
option (9) is correct.

Like? Yes (1) | No (3)