Letanías

An=a1+(n-1)D

an=termino general

a1=primer termino

n =diferencia

• sean las progresiones 2 - 7-12  el termino 48 en la progresion

a1=2

d=5

n=48                       

an=2+(n-1)*5

    =2+(47)*5

    =2+235

    =237

•  el primer termino de una progresion aritmetica halla lña diferencia

a=1

n=15

a1=27                                                       an=a1+(n-1)d

                                                                27=-1 + (15-1)d

                                                                27=-1+(14)d

                                                                27+1=14d

                                                                28=14d

                                                                28/14=d