Question

Find the common difference of the A.P.: $1.,2.0,2.2,2.4,.....$

Answer 1

Given A.P is,

$1.8,2.0,2.2,2.4,...\dots$

first term of this A.P is $a_1=1.8$

second term of this A.P is $a_2=2.0$

third term of this A.P is $a_3=2.2$

fourth term of this A.P is $a_4=2.4$

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

putting n=1 in above equation

$d=a_2-a_1=2.0-1.8=0.2$

hence,

common difference $d=0.2$