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❓ Question Explain why: 7 × 11 × 13 + 13 7 \times 11 \times 13 + 13 and 7 × 6 × 5 × 4 × 3 × 2 × 1 + 5 7 \times 6 \times 5 \times 4 \times 3 \tim…

❓ Question Check whether: 6 n 6^n can end with the digit 0 0 for any natural number n n . 🖼️ Solution Image ✍️ Short Solution This is a p…

❓ Concept Question How do graphs change when: Bacterial growth follows first order kinetics Bacterial decay follows second order kinetics aft…

❓ Question An organic compound weighing: 500 mg 500 \text{ mg} produced: 220 mg of C O 2 220 \text{ mg of } CO_2 on complete combustion. Fin…

❓ Concept Question A transition metal: Has highest enthalpy of atomisation in 1st transition series Forms green aqueous ion M 2 + M^{2+} Id…

❓ Question A person's wound was exposed to bacteria and bacterial growth started. Later, antibacterial medicine was applied and bacterial dec…

❓ Question Given that: HCF ( 306 , 657 ) = 9 \text{HCF}(306,657)=9 Find: LCM ( 306 , 657 ) \text{LCM}(306,657) 🖼️ Solution Image ✍️ Short S…

❓ Question Find the LCM and HCF of the following integers by applying the prime factorisation method : (i) 12, 15 and 21 (ii) 17, 23 and 29 (i…

❓ Question Find the LCM and HCF of the following pairs of integers and verify that: LCM × HCF = Product of the two numbers (i) 26 and 91 (ii) 5…