Question

Find the common difference of the A.P.: $119,136,153,170,.....$

Answer 1

Given A.P is,

$119,136,153,170,...\dots$

first term of this A.P is $a_1=119$

second term of this A.P is $a_2=136$

third term of this A.P is $a_3=153$

fourth term of this A.P is $a_4=170$

common difference of an A.P is $(i.e.,d=a_{n+1}-a_n)$

putting n=1 in above equation

$d=a_2-a_1=136-119=17$

hence,

common difference $d=17$