Question

find out a and d for each of the following AP progressions 21,6,-9,-24,-39,-54,​

Answer 1

Answer:a = 21 and d = -15

Step-by-step explanation:

First term of an AP is a

therefore here a is 21

For d

subtract Ist term from second

T2 - T1 = d

6 - 21 = -15

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