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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