the first and the last terms of an A p are 17and 3 50 respectively. if the common difference is 9,how many terms are there and what is their sum?
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Answer:
Step-by-step explanation:
a = 17
d = 9
a + (n-1)d = 350
17 + 9n - 9 = 350
9n + 8 = 350
9n = 342
n = 38
Sum = 38/2(350 + 71)
= 16(421)
= 6736
Hope it helps
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