The ans. should be 1. as the series is 7 6 4 6 2 6 1 6..... here u can see that all the alternate no. r 6 & 7 4 2 1 forms another series in which difference between two adjecent no. goes on decreasing from 3-2-1-0. so 1-0=1. so the ans should be 1.
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The next number is 13... you're adding the previous two numbers together to produce the next in line.
Answer = 21 The next number is the previous 2 numbers added together
This sequence is the squaring of the numbers 1, 3, 5, and 7. The next number is 9^2 = 81.
1/2 then 1/4 1/8 1/16 1/32