Question

T3=5 t4=7 t7=9 t8=10

Answer 1

T3=5 t4=7 t7=9 t8=10

t4 - t3 = 7 -5 =2
accordingly  d ,common difference is 2
first term is 4;
general term ; tr =a +(r)d
                         tr =4 +2r  //