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-11,-7,-3........45
we know that. middle term=a3+d
a=-11 =-3+4
d=a2-a1. = 7
=-7-(-11)
=-7+11. therefore "7" is the middle term
d = 4.
if you want AP add "d" to previous number
we know that. middle term=a3+d
a=-11 =-3+4
d=a2-a1. = 7
=-7-(-11)
=-7+11. therefore "7" is the middle term
d = 4.
if you want AP add "d" to previous number
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