Show that `a_(1), a_(2), …….., a_(n)…..` form an AP where `a_(n)` is defined as below:
(i) `a_(n) = 3 + 4n`. Also find the sum of the first 15 terms in each case.

Show that a_(1),a_(2),*a_(n),... form an AP where a_(n) is defined as below: (i) a_(n)=3+4n (ii) a_(n)=9-5n Also find the sum of the first 15 terms in each case.

Show that a_(1), a_(2) ,……, a_(n) …. Form an AP where a_(n) is defined as below: (i) a_(n) = 3 + 4n , (ii) a_(n) = 9-5n Also find the sum of the first 15 terms in each case.

Show that a_(1), a_(2) ,……, a_(n) …. Form an AP where a_(n) is defined as below: (i) a_(n) = 3 + 4n , (ii) a_(n) = 9-5n Also find the sum of the first 15 terms in each case.

Show that a_(1), a_(2) ,……, a_(n) …. Form an AP where a_(n) is defined as below: (i) a_(n) = 3 + 4n , (ii) a_(n) = 9-5n Also find the sum of the first 15 terms in each case.

Show that a_(1), a_(2) ,……, a_(n) …. Form an AP where a_(n) is defined as below: (i) a_(n) = 3 + 4n , (ii) a_(n) = 9-5n Also find the sum of the first 15 terms in each case.

Show that a_(1), a_(2), ….,a_(n),… form an A.P where an is defined as below : (i) a_(n) = 3 + 4n (ii) a_(n) = 9 - 5n . Also find the sum of the first 15 terms in each case.

Show that a_(1),a_(2),......a_(n),.... from an AP where a_n is defined as below: (1)a_(n)=3+4n(2)a_(n)=9-5n Also find the sum of the first 15 terms in each case.

Show that a_(1),a_(2)"……"a_(n),"……." form an A.P. where a_(n) is defined as below : a_(n)=3+4n