39. The 19th term of an AP is equal to 3 times its 6th term. If its 9th term is
19, find the AP.
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Answered by
0
Answer:
Let a be the first term and d be the common difference of the AP.
Step-by-step explanation:
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Answered by
10
Answer:
a
19
=3a
6
a
9
=19
a+18d=3(a+5d)
a+18d=3a+15d
2a−3d=0
2a=3d,a=
2
3
d
a+8d=19
2
3
d+8d=19
19d=38
d=2
a=3
∴3,5,7,9,....
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