Page 91 - NUMINO Challenge_C1

Type 10-1 Sequences with Two or More Patterns

The sequence below follows a pattern. Find all the terms that have the
number 30.

1, 2, 2, 4, 3, 6, 4, 8, 5, 10,

1 Divide the sequence into two sequences such that each sequence contains
only the terms of odd index ( ) or even index ( ). Find the patterns and
fill in the blanks.
Sequence : 1, 2, 3, 4, 5, , ,
Sequence : 2, 4, 6, 8, 10, , ,

2 What is the index of 30 in Sequence ?

3 What is the index of 30 in Sequence ?

4 The th term of Sequence is the ( 2 1)th term of the whole
sequence, and the th term of Sequence is the ( 2)th term of the
whole sequence. Find the indexes of 30 in the whole sequence.

5 What is the 100th term of the sequence?

88 NUMINO Challenge C1