Which of the following are APs ? If they form an AP, find the common difference $d$ and write three more terms.

(i) $2,4,8,16,....$

(ii) $2,25 ,3,27 ,...$

(iii) $−1.2,−3.2,−5.2,−7.2,...$

(iv) $−10,−6,−2,2,...$

(v) $3,3+2 ,3+22 ,3+32 $

(vi) $0.2,0.22,0.222,0.2222,....$

(vii) $0,−4,−8,−12,...$

(viii) $−21 ,−21 ,−21 ,−21 ,...$

(ix) $1,3,9,27$

(x) $a,2a,3a,4a,...$

(xi) $a,a_{2},a_{3},a_{4},...$

(xii) $2 ,8 ,18 ,32 ,...$

(xiii) $3 ,6 ,9 ,12 ,...$

(xiv) $1_{2},3_{2},5_{2},7_{2},..$

(xv) $1_{2},5_{2},7_{2},73,..$