Question

Without adding, find the sum (1+3+5+7+9+11+13+15+17)

Answer 1

Answer:

First: Count the number given in the question

Second:There are 9 numbers so we will multiply by one more 9 like 9*9 gives us 81 so the sum is 81.

Answer 2

Answer:

$\large\underline{ \underline{ \red {your \: \: \: answer \implies \: 81}}}$

Step-by-step explanation:

$\bf\pink{first \: count \: the \: \: number \: of \: numbers \: there \: are \: nine \: numbers \: }- \\ \\ \bf\purple{1,3,5,7,9,11,13,15,17} \\ \bf\blue{now \: since \: they \: are \: all \: odd \: the \: sum \: is \: the \: square \: of \: the \: total }\\ \\ \bf\orange{no \: of \: numbers \: </p><p>that \: means \: the sum \: is \: {9}^{2} which \: is \: 81</p><p>this \: only \: works } \\ \\ \bf\green{for \: consecutive \: odd numbers}\\ \\ \bf\red{ \implies \: 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 } \\ \bf\red{ \:without \: adding \: sum \mapsto \: {9}^{2} = {81} }$

$\large\boxed{ \fcolorbox{green}{blue}{hope \: it \: help \: you}}$