Check the common difference (interval). If its the same for the given consecutive numbers, then the succeeding term is simply obtained by adding the common difference (interval) to the preceding term. Common difference =7−11,3−7,−1−3=−4 Each of the common differences are the same hence succeeding terms are obtained by adding the common difference to preceding terms. First missing term =−1+−4=−5 Second missing term =−5+−4=−9