Select the option that identifies the error and supplies the correction for the following line taken from an article about growing obesity.
Obesity in teenage children is a major concern between parents today.
Fill in the blank by choosing the correct option to complete the notice on a school notice board.
We are pleased to announce that our Annual Sports Day............ on 30th April, 2025 at the school playground from 9 a.m. to 3 p.m.
For any natural number $k$, let $a_k = 3^k$. The smallest natural number $m$ for which \[ (a_1)^1 \times (a_2)^2 \times \dots \times (a_{20})^{20} \;<\; a_{21} \times a_{22} \times \dots \times a_{20+m} \] is: