Hindi, asked by ashoksapre362, 2 months ago

प्र. 1. (A) पुढील प्रत्येक उपप्रश्नासाठी चार पर्यायी उत्तरे दिली आहेत. त्यांपैकी अचूक उत्तराचा पर्याय
निवडून त्याचे वर्णाक्षर लिहा :
(i) 4r +5y = 19 या रेषेचा आलेख काढण्यासाठी x=1 असताना, y ची किंमत काढा.
(A)4 (B)3 (C)2 (D) -3
(ii) 21-5x + 2= 0 या वर्गसमीकरणाच्या विवेचकाची किंमत पुढीलपैकी कोणती?
(A) -5 (B) 17 (C)/2 (D) 2/2-5
(iii) जर a=4 व t20 = 36, तर अंकगणिती श्रेढीतील पहिल्या 20 पदांची बेरीज किती?
(A) 40
(B) 200 (C) 400 (D) 800
(iv) पुढील पर्यायांपैकी कोणती संभाव्यता असू शकणार नाही?
2
(A) 15% (B)
(C) 0.7 (D) 1.5
3​

Answers

Answered by pulakmath007
2

SOLUTION

TO DETERMINE

(i) In the line 4x + 5y = 19 when x = 1, find the value of y.

(A) 4

(B) 3

(C) 2

(D) -3

(iii) If a = 4 and  \sf{t_{20} = 36  }

what is the sum of the first 20 terms in the arithmetic series?

(A) 40

(B) 200

(C) 400

(D) 800

EVALUATION

Here the given equation of the line is

4x + 5y = 19

When x = 1 we get

4 + 5y = 19

 \sf{ \implies \: 5y = 15}

 \sf{ \implies \: y = 3}

So the required value of y = 3

Hence the correct option is (B) 3

(iii) Here it is given that a = 4 and  \sf{t_{20} = 36  }

Hence the required sum of the first 20 terms in the arithmetic series

 \displaystyle  \sf{ =  \frac{n}{2} \bigg(First  \: term +  Last  \: term  \bigg) }

 \displaystyle  \sf{ =  \frac{20}{2} \bigg(4 + 36 \bigg) }

 \displaystyle  \sf{ =  10 \times 40 }

 \displaystyle  \sf{ = 400 }

Hence the correct option is (C) 400

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