Question

the 14th term of an A.P. is twice its 7th term if its 5th term is 10. Find the first term and common difference



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Answer 1

Given 5th term = 10
a + 4d = 10............(I)

and 14th term = 2(7th term)
a + 13d = 2(a + 6d)
a + 13d = 2a + 12d
d = a....... (II)

From (I) and (II),
a (First term) = 2
d (common difference) = 2

Answer 2

Answer:

the first term is 2 and the common difference is also 2 it is the correct answer so please mark me as brainliest. Thanks!