Question

Which of following is not an AP?निम्नलिखित में से कौन सी A.P. नहीं है? *

2,2,2,2,….

10,7,4,….

23,21,18,14….

2,7,12,……

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Answer 1

23,21,18,14….

because the common difference is not constant

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Thank you :)

Answer 2

Answer:

23, 21, 18, 14 is not an AP