Question

28, 24, 28 so on are in AP which terms of the given ap is minus 64​

Answer 1

28, 24, 28 are not in AP...

Answer 2

QUESTION:

28, 24, 20 so on are in AP which terms of the given ap is minus 64.

$\red{correct AP sequence}$

ANSWER:

FORMULA USED:

$tn = a + (n - 1)d$

where

$a = first \: term$

$d = common \: difference$

GIVEN AP HAS

$a = 28$

$d = 24 - 28 \\ d = - 4$

so

$tn = 28 + (n - 1) - 4 \\ - 64 = 28 - 4n + 4 \\ - 64 = 32 - 4n \\ - 96 = - 4n \\ 24 = n$

SO FINAL ANSWER:

24Tth TERM WILL BE -64