Question

In an ap of first term is 2 the sum of first 5 terms is one fourth of the sum of next 5 terms

Answer 1

Answer:

a=2

s5=1/4 s10-s5

s5=1/4 (s10-s5)

s5=5/2(4+4d)= 10+10d=10(1+d)

s10=10/2(4+9d)= 20+45d=5(4+9d)

10(1+d)=20+45d-10+10d

d=-6