1.

(a) 4, 8, 12, 16 (b) 12. 16, 20, 24(c) 10, 12, 14, 16 (d) 2, 4, 6. 8

Answer»

a-d,a,a+d,a+2d

a-d+a+a+d+a+2d = 72 4a+2d = 72 2a+d = 36

a+2d = 2(a-d) a+2d = 2a-2d a=4d

8d+d = 9d = 36 d = 4 a = 16 12,16,20,24



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