Question

find the sum of A,P,34+32+30+....+10​

Answer 1

Answer:

AP - 34+32+30+....+10

A¹ =34

A² =32

Comman Difference

= A² - A¹

= 32-34

= -2

An = 10

An = a + ( n-1 ) d

10 = 34 + ( n-1 )(-2)

10 = 34 + ( -2n+2 )

2n-2 = 34 - 10

2n = 24 +2

n = 26/2

n = 13

Sn = n/2( a+l )

Sn = 13/2 ( 34+10 )

Sn = 13/2 ( 44 )

Sn = 13 × 22

Sn = 286

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