V term of an ap is 20 and the sum of its 7 and 11 term is 64 find the common difference
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5th = (a + 4d = 20) ___ (1)
7th + 11th = 64
a+6d + a+10d = 64
2a + 16d = 64
(a+8d = 32) ___ (2)
Equalising both equations (1) & (2)
a+4d = 20
a+8d = 32
- - -
subtracting (2) from (1)
________
-4d = -12
d = 3
common difference is 3.
Plz Mark It As Brainliest Answer And Drop A ♥
7th + 11th = 64
a+6d + a+10d = 64
2a + 16d = 64
(a+8d = 32) ___ (2)
Equalising both equations (1) & (2)
a+4d = 20
a+8d = 32
- - -
subtracting (2) from (1)
________
-4d = -12
d = 3
common difference is 3.
Plz Mark It As Brainliest Answer And Drop A ♥
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