find missing no 15 13 12 12 11 11 ?

Answer Posted / vikram

18 15 13 12 12 11 11 ?
\/ \/ \/ \/ \/
3 2 1 0 1 0 (step 2) seeing the difference
\/ \/ \/ \/ \/
1 1 1 1 1 again seeing difference all are 1 so
if 3 comes next to 2 in step 2 difference is 1

so the next number to come next to 15 is 18 ...............
see the answer from bottom up .starting from down to top
i am not sure this is right if anybody knows means tell please

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