Question

in an arthmetic progression the fith and the ninth term is 45 and 81​

Answer 1

Answer:

$ap \: \: \: \: \: is \: \: \: \: \: \: 9 \: \: \: \: \: 18 \: \: \: \: 27 \: \: \: 36 \: \: \: \: 45 \: \: \: \: \: 54 \: \: \: \: 63 \: \: \: \: 72 \: \: \: \: \: 81...$

Step-by-step explanation:

$a + (4)d = 45 \\ \\ a + 8d = 81 \\ \\ soving \: we \: get \\ \\ 4d = 36 \\ \\ d = 9 \\ \\ a = 45 - 4(9) \\ \\a = 45 - 36 \\ \\ a= 9 \\ \\ ap \: \: \: \: \: is \: \: \: \: \: \: 9 \: \: \: \: \: 18 \: \: \: \: 27 \: \: \: 36 \: \: \: \: 45 \: \: \: \: \: 54 \: \: \: \: 63 \: \: \: \: 72 \: \: \: \: \: 81...$