The appearance P: dinosaurs were at their peak Q: of the first mammals on the earth R: at the time when S: went almost unnoticed
The appearance P: dinosaurs were at their peak Q: of the first mammals on the earth R: at the time when S: went almost unnoticed Correct Answer SPRQ
n + 3 = even + odd = odd 3n + 1 = odd×even + odd = even + odd = odd n2 + 1 = even2 + odd = odd 2(n + 3) = 2(even + odd) = even অর্থাৎ দেখা যাচ্ছে option (d) cannot be odd । সূত্র মনে না থাকলে n কে যে কোন even সংখ্যা (যেমন - 2) ধরেও করা যায়।