find the sum of AP 3,6,9....upto 18 terms
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find the sum of AP 3,6,9....upto 18 terms
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Answer:
513
Step-by-step explanation:
use formula Sn = n/2 (2a + (n -1) d)
=9 (6 + (17) 3)
= 9 × 57
=513