Question

a20=45 a=7 find common difference​

Answer 1

Answer:

2

Step-by-step explanation:

a+(n-1)d

a+19d=45

7+19d=45

19d=38

d=38/19

d=2

Answer 2

$\huge{Solution:-}$

$a_{20}=45 \\ {\boxed{\red{a+(n-1)d=a_n }}} \\ 7+(20-1)d=45 \\ 7+19d=45 \\ 19d=45-7 \\ d=\dfrac{38}{19} \\ :\implies {\boxed{\pink{2}}}$

Answer 3

$\huge{Solution:-}$

$a_{20}=45 \\ {\boxed{\red{a+(n-1)d=a_n }}} \\ 7+(20-1)d=45 \\ 7+19d=45 \\ 19d=45-7 \\ d=\dfrac{38}{19} \\ :\implies {\boxed{\pink{2}}}$