WHAT IS [ 5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+55+5+5+5+5+5+5+5+55+5+5+5+55+5+5+5+55+5+5+5+55+5+5+5+55+5+5+5+55+5+5+5+55+5+5+5+55+5+5+5+5
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Answered by
1
Answer:
Oil, coal, natural gas, metals, stone and sand are natural resources. Other natural resources are air, sunlight, soil and water. Animals, birds, fish and plants are natural
Answered by
0
Answer:
s
n
=5(1+11+111+... to n terms)
⇒s
n
=
5
9
(9+99+999+... to n terms)
⇒S
n
=
9
5
{(10−1)+(10
2
−1)+(10
3
−1)+...+(10
n
−1)}
⇒S
n
=
9
5
{(10+10
2
+10
3
+...+10
n
)−n}
⇒S
n
=
9
5
{10(
10−1
10
n
−1
)−n}
⇒S
n
=
9
5
{
9
10
(10
n
−1)−n}=
81
5
(10
n+1
−9n−10).
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SIMILAR QUESTIONS
star-struck
If the sum of first two terms of an infinite GP is 1 and every term is twice the sum of all the successive terms, then its first term is?
Medium
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