pls tell this ques fast
solve anyone
related to gp
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a1 = 1 , a2 = 3 , a3 = 9 , n = 8.
r = a2/a1 = 3/1 = 3.
a8 = a1 r8-1.
= (1)(3)7.
= (3)7.
a8 = 2187.
r = a2/a1 = 3/1 = 3.
a8 = a1 r8-1.
= (1)(3)7.
= (3)7.
a8 = 2187.
mahadi:
4(1+11+111.............to n terms)
(4/9)(9+99+999+..... to n terms)
(4/9){(10-1)+(10sq -1)+(10cube - 1)+.....(10n -1)}
(4/9){(10+10sq+10cube+.....+10n )-(1+1+1+.....+n times)}
=(4/9){10 {(10n -1 )/(10 - 1)} - n (1)}
(4/9){(10/9)(10n- 1) - n}
ans . 44444
ok
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