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If the sum of 3rd term and 8th term of an AP is 7 and the sum of 7th term and 14th term is -3 then find the 10th term?
Most Upvoted Answer
If the sum of 3rd term and 8th term of an AP is 7 and the sum of 7th t...
A+3-1×d+a+8-1×d=7
a+2d+a+7d=7
2a+9d=7........ (i)
&
a+7-1×d+a+14-1×d=-3
a+6d+a+13d=-3
2a+19d=-3...... (ii)
&
from(i) n( ii)
2a+9d=7
2a+19d=-3
------------------
-10d=10
d=-1.........
then..!!!...from (i )
2a+9×-1=7
2a-9=7
2a=16
a=8.....
T10=a+9d
=8+9×-1
=8-9
=-1
Community Answer
If the sum of 3rd term and 8th term of an AP is 7 and the sum of 7th t...
A+2d +a+7d=7. I
a+6d+a+13d=-3. I I
now
2a+9d=7
2a+19d=-3. NOW BY elimination method
- - +
0-10d =10
d= -1now put d
a=8
now 10th term. by putting a and d
a+9d=a10
8+9×-1=
show the 10th term is -1
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If the sum of 3rd term and 8th term of an AP is 7 and the sum of 7th term and 14th term is -3 then find the 10th term?
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If the sum of 3rd term and 8th term of an AP is 7 and the sum of 7th term and 14th term is -3 then find the 10th term? for Class 10 2024 is part of Class 10 preparation. The Question and answers have been prepared according to the Class 10 exam syllabus. Information about If the sum of 3rd term and 8th term of an AP is 7 and the sum of 7th term and 14th term is -3 then find the 10th term? covers all topics & solutions for Class 10 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for If the sum of 3rd term and 8th term of an AP is 7 and the sum of 7th term and 14th term is -3 then find the 10th term?.
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