Recently Active Questions

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T(n) = 3n2 + 4n. Find S(n) ...

1.1+2.3+3.5+4.7+........ upto n terms is ...

A man tries to pay off Rs 900 in 40 monthly instalments which are in AP. When 30 are paid, he dies leaving a third of the total amount unpaid. Find the 2nd instalment ...

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1/(b+c), 1/(c+a), 1/(a+b) are in AP. which is true ...

pth term of an AP is 1/q. qth term of an AP is 1/p. Sum of first pq terms is ...

Sum of 3 numbers in AP is 12. Sum of cubes of these is 408. The product is ? ...

3 numbers are in AP. Sum is 15. Sum of the squares of the extremes is 58. Find the series. ...

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Sum of p terms of an AP is 1/q. And of q terms is 1/p. find the sum of p+q terms. (p≠q) ...

Find the nth term of the series whose sum to n terms is given by 5n2+6n ...

Divide 20 into 4 parts that are in AP. Such that the product of 1st and 4th term is to the product of 2nd and 3rd term is 2:3 ...

For an AP, T1=10, d=-1/3. Find S31-S30 ...

sum of a few terms of the series 93+90+87+.... is 975. If the last term is -ve . find the last term. ...