Math, asked by damanyadav82, 10 months ago

find the common difference of the AP whose sum of first four terms is 40 and that of fourteen terms is 280

Answers

Answered by uttara29

1

Answer:

d = 56

Step-by-step explanation:

s4 = 4/2( 2a+3d)=40

s14=14/2(7a+13d)=280

4a+3d=40

14a+13d=280

solve them

d=56

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