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Questions(204)

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Sum of the series in arithmetic progression is $72.$ The first term is $17$ and the common difference is $-2.$ Find the number of terms.

view details (1 answer)The sum of $3$ numbers is $132.$ If third number be one third of the first and the first number be twice the second, find the second number.

view details (1 answer)how many four digit numbers begin and end with an even numbers? Can we solve this problem through arithmetic progression? how?

view details (1 answer)$1+(1+a)r+(1+a+a^2)r^2+\cdots$ to $n$ terms.

Find the sum of the above series?

view details (1 answer)Find the sum of the above series?

$(x+y)+(x^2+xy+y^2)+(x^3+x^2y+xy^2+y^3)+\cdots\text{ to }n\text{ terms }$

Find the sum of the above series?

view details (1 answer)Find the sum of the above series?