Find the sum of 30th term of a given A.P. 3,9,15,21,......
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Find the sum of 30th term of a given A.P. 3,9,15,21,......
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Answer:
1395
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Answer:
a=3
d=6
n=30
Sn= n / 2 × ( 2a + (n-1) × d )
Sn = 30 / 2 × ( 2 × 3 + ( 30-1 ) × 6 )
Sn = 15 ( 6 + 29 × 6 )
Sn = 15 ( 6 + 174 )
Sn = 15 × 180
Sn = 2700