Share

# Find the sums given below : 34 + 32 + 30 + . . . + 10 - CBSE Class 10 - Mathematics

ConceptSum of First n Terms of an AP

#### Question

Find the sums given below :

34 + 32 + 30 + . . . + 10

#### Solution

34 + 32 + 30 + ……….. + 10

For this A.P.,

a = 34

d = a2 − a1 = 32 − 34 = −2

l = 10

Let 10 be the nth term of this A.P.

l = a + (− 1) d

10 = 34 + (n − 1) (−2)

−24 = (− 1) (−2)

12 = n − 1

n = 13

S_n = n/2(a+1)

=13/2(34+10)

=(13xx44)/2 = 13 xx 22

= 286

Is there an error in this question or solution?

#### APPEARS IN

NCERT Solution for Mathematics Textbook for Class 10 (2019 to Current)
Chapter 5: Arithmetic Progressions
Ex.5.30 | Q: 2.2 | Page no. 112

#### Video TutorialsVIEW ALL [5]

Solution Find the sums given below : 34 + 32 + 30 + . . . + 10 Concept: Sum of First n Terms of an AP.
S