Grade 12th pass10 grade maths
10. If 17th term of an A.P. exceeds its 10th term by 7. Find the common difference.
10. If 17th term of an A.P. exceeds its 10th term by 7. Find the common difference.
1 Answer
Pawan Prajapati
We know that, for an A.P series;
an = a+(n−1)d
a17 = a+(17−1)d
a17 = a +16d
In the same way,
a10 = a+9d
As it is given in the question,
a17 − a10 = 7
Therefore,
(a +16d)−(a+9d) = 7
7d = 7
d = 1
Therefore, the common difference is 1.
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