Write about omicron and corona
Answers
Answer:
Omicron, the recently-discovered variant of the coronavirus which was first detected in southern Africa, has been declared to be a variant of concern by the World Health Organization (WHO).
The WHO said on Friday that omicron, named after a letter in the Greek alphabet, was first reported to it from South Africa on November 24 and the first known confirmed infection was from a specimen collected on November 9.
Explanation:
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Answer:
\large\underline{\sf{Solution-}}
Solution−
Given that,
In a new year, Reenu saved ₹50 in the first week and then increased her weekly savings by ₹17.50. If in the nth week, her weekly savings become ₹207.50.
So,
Savings in first week = ₹ 50
Savings in second week = ₹ 50 + 17.50 = ₹ 67.50
Savings in third week = 67.50 + 17.50 = ₹ 85
.
.
.
.
.
Savings in nth week = 207.50
So, the savings
\begin{gathered}\rm \: 50, \: 67.50, \: 85, \: \cdots \cdots, \: 207.50 \: forms \: an \: AP \: with \\ \\ \end{gathered}
50,67.50,85,⋯⋯,207.50formsanAPwith
\begin{gathered}\rm \: First \: term, \: a \: = \: 50 \\ \end{gathered}
Firstterm,a=50
\begin{gathered}\rm \:Common \: difference, \: d \: = \: 17.50 \\ \end{gathered}
Commondifference,d=17.50
\begin{gathered}\rm \: {n}^{th} \: term \: = \: 207.50 \\ \\ \end{gathered}
n
th
term=207.50
Wᴇ ᴋɴᴏᴡ ᴛʜᴀᴛ,
↝ nᵗʰ term of an arithmetic sequence is,
\begin{gathered}\begin{gathered}\red\bigstar\:\:{\underline{\orange{\boxed{\bf{\green{a_n\:=\:a\:+\:(n\:-\:1)\:d}}}}}} \\ \end{gathered}\end{gathered}
★
a
n
=a+(n−1)d
Wʜᴇʀᴇ,
aₙ is the nᵗʰ term.
a is the first term of the sequence.
n is the no. of terms.
d is the common difference.
Tʜᴜs,
\begin{gathered}\rm \: 207.50 = 50 + (n - 1) \times 17.50 \\ \end{gathered}
207.50=50+(n−1)×17.50
\begin{gathered}\rm \: 207.50 - 50 = (n - 1) \times 17.50 \\ \end{gathered}
207.50−50=(n−1)×17.50
\begin{gathered}\rm \: 157.50 = (n - 1) \times 17.50 \\ \end{gathered}
157.50=(n−1)×17.50
\begin{gathered}\rm \: 9 = n - 1 \\ \end{gathered}
9=n−1
\begin{gathered}\bf\implies \:n \: = \: 10 \\ \\ \end{gathered}
⟹n=10
\rule{190pt}{2pt}
{ \red{ \mathfrak{Additional\:Information}}}AdditionalInformation
↝ Sum of n terms of an arithmetic sequence is,
\begin{gathered}\begin{gathered}\red\bigstar\:\:{\underline{\orange{\boxed{\bf{\green{S_n\:=\dfrac{n}{2} \bigg(2 \:a\:+\:(n\:-\:1)\:d \bigg)}}}}}} \\ \end{gathered}\end{gathered}
★
S
n
=
2
n
(2a+(n−1)d)
Wʜᴇʀᴇ,
Sₙ is the sum of n terms of AP.
a is the first term of the sequence.
n is the no. of terms.
d is the common difference.
Explanation:
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