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Answer:
C.
11. 7, 10, 13, 16 - Arithmetic, Common Difference is 3, Next 2 terms are 19 and 22
12. 4, 12, 36, 108 - Arithmetic, Common Difference is n × 3, Next 2 terms - 324 and 972
13. 2, -2, -6, -10 - Arithmetic, Common Difference is -4, Next 2 terms are -14 and -18
14. 2, 1, 1/7?, 1/4 - It is not arithmetic
15. 1/3, 2/3, 1 - Arithmetic, Common Difference is 1/3, Next 2 terms are 1 1/3 and 1 2/3