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গণিত (Mathematics) MCQ

121. 84 x 9 = 84 x (10 - 1) আৰু 84 x 99 = 84 x (100 - 1) হ'লে 84 x 999 হ’ব

A. 84 x (1000 - 1)

B. 84 x (10000 - 1)

C. 84 x (1000 + 1)

D. ওপৰৰ এটাও নহয়

Answer :A

Solution :

122. 26 x 25 = 26 x ¹⁰⁰/₄ হ'লে 27 x 125 হ’ব

A. 27 x ¹⁰⁰⁰/8

B. 27 x ¹⁰⁰⁰/₄

C. 27 x ¹⁰⁰/₄

D. 27 x ¹⁰⁰/₂

Answer :A

Solution :

123. 51 x 9 = 51 x (10 - 1) হ'লে 71 x 99 হ’ব

A. 71 x (10 - 1)

B. 71 x (100 - 1)

C. 51 x (10 - 1)

D. 51 x (100 - 1)

Answer :B

Solution :

124. আমি জানো যে ত্ৰিভূজ আকৃতত সজাব পৰা সংখ্যাবোৰ হ'ল 1, 3, 6 10, 15........। যদি ত্ৰিভূজ নিৰ্ণয় কৰিব পৰা সংখ্যা Xn = n(n + 1)/2 সূত্ৰৰ দ্বাৰা পাব পাৰি তেন্তে 10 তম ত্ৰিভূজ আকৃতিৰ সংখ্যা হ'ল

A. 55

B. 28

C. 72

D. 50

Answer :A

Solution :

125. যদি ঘনক আকৃতিৰ সংখ্যা নিৰূপণৰ বাবে Xn = n³ সুত্ৰ ব্যৱহাৰ কৰিব পাৰি, তেন্তে 11 তম ঘনক আকৃতিৰ সংখ্যা হ'ব

A. 1728

B. 1331

C. 121

D. 1000

Answer :B

Solution :

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