Question

Show that the progression 5, 9, 13, 21 .... is an AP . Write down Its First Term and the Common Difference

Answer 1

Answer:

It's not an AP.

Step-by-step explanation:

since, difference between consecutive 2 numbers is not same.

hence, it is an AP.

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Answer 2

differece between 9 and 5(d1) = 9-5 = 4

d2 = 13-9 = 4

d3 = 21-13 not equal to 4

Therefore its not an ap