Question 8
Find the missing number in the pattern.
a) 7, 21, 35, …, 63, …
b) 100, 50, 150, 100, 200, …, …
c) 2, …, 18, …, 162, 486.
Self-study input instruction (editorial): use the intended rules of adding 14 in (a), alternating subtract 50 then add 100 in (b), and multiplying by 3 in (c). Enter all six missing numbers in part order, left to right, separated by semicolons. Format: a-first;a-second;b-first;b-second;c-first;c-second.
**Editorial input note:** Use no spaces before or after semicolons.
a) 7, 21, 35, …, 63, …
b) 100, 50, 150, 100, 200, …, …
c) 2, …, 18, …, 162, 486.
Self-study input instruction (editorial): use the intended rules of adding 14 in (a), alternating subtract 50 then add 100 in (b), and multiplying by 3 in (c). Enter all six missing numbers in part order, left to right, separated by semicolons. Format: a-first;a-second;b-first;b-second;c-first;c-second.
**Editorial input note:** Use no spaces before or after semicolons.