1.

Find a,b,and c such that following numbers are in AP:a,7,b,23,c.

Answer»

\blue{\bold{\underline{\underline{Answer:}}}}

\green{\tt{\therefore{Value\:of\:a=-1}}}

\green{\tt{\therefore{Value\:of\:b=15}}}

\green{\tt{\therefore{Value\:of\:c=31}}}

\orange{\bold{\underline{\underline{Step-by-step\:explanation:}}}}

\green{\underline \bold{<klux>GIVEN</klux> :}} \\  \tt:  \implies A.P = a.7.b.23.c \\  \\ \red{\underline \bold{To \: Find :}} \\  \tt:  \implies Value \: of \: a,b \: and \: c = ?

ACCORDING to given QUESTION :

\tt \circ \:  a_{1} = a \\  \\  \tt \circ \:  a_{2} = 7\\  \\\tt \circ \:  a_{3} = b \\  \\\tt \circ \:  a_{4} = 23 \\  \\\tt \circ \:  a_{5} = c \\ \\  \bold{As \: we \: know \: that}  \\  \tt:  \implies 2 a_{2} =  a_{1} +  a_{3} \\  \\ \tt:  \implies 2 \times 7 = a + b \\  \\ \tt:  \implies a + b = 14 -  -  -  -  - (1) \\  \\  \bold{Similarly : } \\ \tt:  \implies 2 a_{3} =  a_{2} +  a_{4} \\  \\ \tt:  \implies 2b = 7 + 23 \\  \\ \tt:  \implies b =  \frac{30}{2}  \\  \\  \green{\tt:  \implies b = 15} \\  \\  \bold{Similarly : } \\ \tt:  \implies 2 a_{4} =  a_{3} +  a_{5} \\  \\ \tt:  \implies 2 \times 23 = b + c \\  \\ \tt:  \implies 46 = 15 + c \\  \\ \tt:  \implies c = 46 - 15 \\  \\  \green{\tt:  \implies c = 31} \\  \\  \text{Putting \: value \: of \: b \: in \: (1)} \\ \tt:  \implies a + 15 = 14 \\  \\ \tt:  \implies a = 14 - 15 \\  \\  \green{\tt:  \implies a =  - 1}



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