If for an a.p. a5 = a10 = 5a ,then a15 is..
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Answered by
8
Answer
a5 = a10 = 5a
=》 a5 = 5a
a + 4d = 5a
a = d
=》 a10 = 5a
a + 9d = 5a
9d = 4a
9d = 4d
d = 0
=》 a15 = a + 14d
= a + 14 (0)
= 0 + 0
= 0
Answered by
8
Answer: a15 = 0
Step by step explanation:
Given that,
a5 = a10 = 5a
» a + 4d = 5a
» 4d = 4a
» d = a..(1)
Also,
a10 = 5a
» a + 9d = 5a
» 9d = 4a
» 9d = 4d..from (1)
» d = 0
a = 0
To find : a15
a15 = a + 14d
= 0 + 14(0)
= 0
Thus, a15 = 0
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