Question

5.
Find the sum of 30 terms of an A.P. a1 a2, .........., a30 if it is known that
a1+ a3 + a28+ a30 = 48.
A) 180
B) 360
C) 720
D) none of these​

Answer 1

Answer:

you can find it by Sum of first n terms of an AP: S =(n/2)[2a + (n- 1)d]

AND BY FORMULA=a+(n-1)d

where a=First term of an Arithmetic progression

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Answer 2

Answer:

none of these

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