please solve question number 13
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Given
First term = a = 12
Let the 7th term = a + 6d = 12 + 6d
and 11th term = a + 10d = 12 + 10d
Given that 7th term is 24 less than 11th term
then the equation will be
12 + 6d = 12 + 10d - 24
-4d = -24
d = 6
Now d = 6 a = 12
Tn = a +( n - 1)d
T20 = 12 + (20 - 1)6
T20 = 12 + (19)×6
T20 = 12 + 114 = 126
Thus the 20th term of A.P is 126
Answered by
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Here is your answer mate
⤵⤵
Let the 7th term be a7 and 11th term be a11 ,
where a1(1st term) =12
a11 -a7 = 24
(a+ 10d) - (a+6d) = 24
a +10d - a -6d =24
4d =24
hence,d= 6
now 20th term, a20 = a+19d
= 12+ 114 = 126......ans.
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