Question

if 4, A, A2, A3, 28 are in ap find the value of A3.

Answer 1

First term, a=4 ;fifth term or last term, l=28 Total No. of terms , n=5 Let the common difference be d. Then, T5 = 4 + (5-1)d=28 (Tn = a + (n-1)d) = 4 + 4d =28 = 4d = 28-4 = d = 24/4 = d= 6 ;Now, A3 = T4 = 4 + (4-1)6 = 4 + 3×6 = 4+18 = 22

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Answer 2

Answer:

Step-by-step explanation: