Question

How many terms of the AP : 24, 21, 18, . . . must be taken so that their sum is 78?

Answer 1

Thanks dedo bhit jroorat hai

Ans would be..... 5

Dedooooo thanks

Answer 2

HOLA

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The given Ap is 24 , 21, 18 .......


[•] First term = 24

[•] Common difference = ( 24 - 21 ) = -3

So. , a = 24 , d = - 3

[•] To find how many terms to be taken out so there sum is 78 , we have

An = 78 = 24 + ( n - 1) -3 = 78

= 24 + (n - 1) × - 3 = 78

=====>> -3n = 105 ==> n = 35

So , 35 terms must be removed to get the sum 78

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HOPE U UNDERSTAND ❤❤❤