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Rudik [331]
3 years ago
7

A pattern of letter arrangements begins with the 3 steps below. first continue the pattern for 3 more steps:

Mathematics
2 answers:
Anon25 [30]3 years ago
6 0
1)
4. ABCDCBA
5. ABCDEDCBA
6. ABCDEFEDCBA

2) 1, 3, 5, 7, 9, 11

3) 19
Leokris [45]3 years ago
6 0

Answer:

1, 3, 5, 7, 9, 11

19

Step-by-step explanation:

Given,

Step 1 : A,

Step 2 : ABA

Step 3 : ABCBA

By proceeding the pattern,

Remaining steps are,

Step 4 : ABCDCBA,

Step 5 : ABCDEDCBA

Step 6 : ABCDEFFEDCBA

Thus, the number of letters in each steps are,

1, 3, 5, 7, 9, 11

Which is an AP having first term, a = 1,

Common difference, d = 3 - 1 = 2,

Hence, the number of letters in step 10 = 10th term of the above AP

=  a + (10-1)d

= 1 + 9(2)

= 1 + 18

= 19

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