find k given the consecutive arithmetic terms| Sequenc| Arithmetic Progression by Maths Magic

find k given the consecutive arithmetic terms| Sequenc| Arithmetic Progression by Maths Magic find k given the consecutive arithmetic terms: a) 32,K,3 b) K, 7, 10 c) K+1, 2K+1, 13 d) K-1, 2K+3, 7-K e) K, K^2, K^2+6 f) 5, K, K^2-8