Math, asked by wwwlakshmipushpa, 5 hours ago

if the Arithmetic progression Sn= 3n+5 then the value of d is​

Answers

Answered by amansingh108065
0

Answer:

Step-by-step explanation:

Sn =n/2 (2a+n_1)d sister solve kr lo

Answered by ajay8949
0

  \:  \:  \:  \:  \:  \:  \:  \:  \: \sf {\binom{s}{ \:  \:  \: n}  = 3n + 5}

⇢   \:  \: \sf{\binom{s}{ \:  \:  \: 1}  = 3(1) + 5}

⇢ \:  \:  \sf{  \binom{s}{ \:  \:  \: 1}  = 8}

Since sum of first terms of A. P. is equal to it's first term.

\:  \:  \sf{ so \:  \:  \:  \:  \:  \:  \: a = 8}

⇢    \:  \:  \sf{\binom{s}{ \:  \:  \: 2}  = 3(2) + 5}

⇢ \: \:   \sf {\binom{s}{ \:  \:  \: 2}  = 11}

As we know,

 \:  \:  \:  \:  \:  \:  \:  \:  \sf \purple{ \binom{a}{ \:  \:  \: 2}  =  \binom{s}{ \:  \:  \: 2}  -  \binom{s}{ \:  \:  \: 1}}

⇢  \: \sf {\binom{a}{ \:  \:  \: 2}  = 11 - 8}

⇢ \sf{\:  \binom{a}{ \:  \:  \: 2} = 3}

 \sf{also  \:  \:  \: \:  \boxed{ \sf \green{ d =  \binom{a}{ \:  \:  \: 2}  -  \binom{a}{ \:  \:  \: 1}} }}

⇢ \:  \:  \:  \:  \:  \ \sf {d =  3 - 8}

⇢ \:  \:   \:  \:  \:  \: \sf \pink {d =  - 5}

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