Find the sum of 2 + 7 + 12 + ... to 25 terms??. Its Urgent
Answers
Answered by
2
Answer:
1550
Step-by-step explanation:
2 + 7 + 12 + ----- + a25
This numbers are in AP.
first term, a = 2
common difference, d = 7 - 2 = 5
sum of first n terms in an AP =
\frac{n}{2} (2a + (n - 1)d)
sum of first 25 terms for n = 25 is
\frac{25}{2} (2 \times 2 + (25 - 1)5)
= 1550
Answered by
0
Answer:
a=2, d = a2-a1 = 7-2 = 5 n = 30 an = ?
Formula Know that an = a+(n-1)d
a30 = 2+(30-1)5
a30 = 2+(29)5
a30 = 2+145
a30 = 147
Step-by-step explanation:
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