Question

if sum to 'n' terms of an AP is 3n*+4n then the common difference of AP is_​

Answer 1

Answer:

sn=3n+4n

put n=1

s¹=3(1)+4(1)=7(a1)

put n=2

s²=3(2)+4(2)=14(a1+a2). a2=7

put n=3

s³=3(3)+4(3)=21. ( a1+a2+a3). a3=7

.common difference = a2-a1=0

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