Question

Find the sum of 2+7+12 to 25 terms

Answer 1

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

$\frac{25}{2} (2 \times 2 + (25 - 1)5)$

$= 1550$

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Answer 2

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)

2

n

(2a+(n−1)d)

sum of first 25 terms for n = 25 is

\frac{25}{2} (2 \times 2 + (25 - 1)5)

2

25

(2×2+(25−1)5)

= 1550

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