Question

check whether 57 is a term of the AP 10 15 20...​

Answer 1

Answer:

No 57 is not a term of the AP

Answer 2

Answer:

a+(n-1)d= an

a=10 ,d=5

Step-by-step explanation:

$57 = a +( n - 1)d \\ 57 - 10 = (n - 1)5 \\ 47 \div 5 = n - 1 \\ 9.4 + 1 = n \\ n = 10.4 \: ans$

no