If 5th and 10th term of A.P are 13 and 23 respectively then find sum of first 30 terms
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2
Answer:
Sum of the first 30 terms is 1020.
Step-by-step explanation:
5th term is 13 = a + 4d
10th term is 23 = a + 9d
Two equations are: a + 4d = 13
a + 9d = 23
By solving two equations, we get
d = 2 and a = 5
Sum of the first 30 terms is n/2 (2a +(n-1)d)
= 30/2 (10 + (29)2)
=15 (68)
= 1020
Answered by
2
Answer:
the sum of thirty terms is 1020
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