Instructions

A sequence is given in which one term (or more terms) is missing. From the given options, choose the correct one that can complete the sequence--

Question 7

1, 6, 15, ?, 45, 66, 91

Solution

The series is a follows

1 x 1

2 x 3

3 x 5

4 x 7

5 x 9

6 x 11

7 x 13, etc

The numbers on the left increase by 1 and the numbers on the right increase by 2

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