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Answer:
a15 = 70
Step-by-step explanation:
a3 = 10 ( given)
a3 = a + 2d (1)
10 = a + 2d (1)
a5 = 20 ( given )
a5 = a + 4d (2)
20 = a + 4d (2)
Now, subtract (1) from (2)
20 = a + 4d
10 = a + 2d
- = - -
10 = 2d
10/2 = d
5 = d
Now, put d = 5 in (2)
20 = a + 4(5)
20 - 20 = a
0 = a
therefore, a15 = a + 14d
a15 = 0 + 14(5)
Ans: a15 = 70
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Answer:
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