In an arithmetic progession,common difference= -4 and the seventh term (a7) is 4, find the first number?
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Answered by
1
Given:
a₇ = 4 ; d = -4
_______________________________________________________
a₇ = a + 6d
4 = a + 6(-4)
4 = a - 24
a = 28
_______________________________________________________
☺ ☺ ☺ Hope this Helps ☺ ☺ ☺
a₇ = 4 ; d = -4
_______________________________________________________
a₇ = a + 6d
4 = a + 6(-4)
4 = a - 24
a = 28
_______________________________________________________
☺ ☺ ☺ Hope this Helps ☺ ☺ ☺
nitthesh7:
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Answered by
2
Heya!
common difference (d) = -4
a7 = 4
Use formula :-
an = a + (n-1)d
So,
a7 = a + (7-1)d
4 = a + 6(-4)
4 = a - 24
a = 28
:D
common difference (d) = -4
a7 = 4
Use formula :-
an = a + (n-1)d
So,
a7 = a + (7-1)d
4 = a + 6(-4)
4 = a - 24
a = 28
:D
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