guys help me plz q no 30 plz
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sum is = (2a+(n-1)d)
let us find the numbers by putting the values of n
n=1, 3:7
n=2, 5:9
n=3, 7:11
n=4, 9:13
let the two series are A and B
and their rth term is ar and br
a1:b1 = 3:7
(a1+a2):(b1+b2) = 5:9
and so on...
a1=3 and b1=7
(a1+a4)(4/2):(b1+b4)(4/2)=9:13
a4=9(2)-3=15
b4=13(2)-7=19
ans is (D)
let us find the numbers by putting the values of n
n=1, 3:7
n=2, 5:9
n=3, 7:11
n=4, 9:13
let the two series are A and B
and their rth term is ar and br
a1:b1 = 3:7
(a1+a2):(b1+b2) = 5:9
and so on...
a1=3 and b1=7
(a1+a4)(4/2):(b1+b4)(4/2)=9:13
a4=9(2)-3=15
b4=13(2)-7=19
ans is (D)
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