Advertisement Remove all ads

Find the sum of the following APs. − 37, − 33, − 29 ,…, to 12 terms - Mathematics

Find the sum of the following APs.

− 37, − 33, − 29 ,…, to 12 terms

Advertisement Remove all ads

Solution

−37, −33, −29 ,…, to 12 terms

For this A.P.,

a = −37

d = a2 − a1 = (−33) − (−37)

= − 33 + 37 = 4

n = 12

We know that,

Sn = `n/2 [2a + (n - 1) d]`

S12 = `12/2 [2(-37) + (12 - 1) × 4]`

= 6[-74 + 11 × 4]

= 6[-74 + 44]

= 6(-30) = -180

  Is there an error in this question or solution?
Advertisement Remove all ads

APPEARS IN

NCERT Class 10 Maths
Chapter 5 Arithmetic Progressions
Exercise 5.3 | Q 1.2 | Page 112
Advertisement Remove all ads
Advertisement Remove all ads
Share
Notifications

View all notifications


      Forgot password?
View in app×