Question

Which sequence can be represented by the expression 7n?

84, 77, 70, 63,…

2, 9, 16, 22,…

7, 14, 21, 28,…

1, 7, 14, 21,…


Im confused.. i dont know what n is so i dont know how to do it.

Answer 1

84, 77, 70, 63,…
The next number is 7 less, so the pattern is -7 (84-7n)

2, 9, 16, 22,…
The next number is 7 more, pattern is +7 (2+7n)

7, 14, 21, 28,…
The next number is also 7 more, pattern is +7 (7+7n)

1, 7, 14, 21,…
The next number is 7 more, pattern is +7 (1+7n) alternatively, if n cannot be 0,
then pattern is 7n

Answer 2

7n where n = 1, 2, 3, 4, .... is {7, 14, 21, 28, ...}